From 60e27511c530b0949fee361a89d3eb9d9f9125af Mon Sep 17 00:00:00 2001
From: AG <43139552+AGandrup@users.noreply.github.com>
Date: Mon, 23 Oct 2023 10:37:11 +0200
Subject: [PATCH] fix(Core/Grid): Address bugs and performance issues
 introduced by visibility notifier implementation (#17480)

* Bug fixes

- Corrected std::chrono from seconds to milliseconds
- Got rid of leftover code that caused objects to not show up on time

* Removed logic to set gameobject as active

- More alignement with TC.
- Reduces CPU usage drastically

* Revert back to using time_t instead of std chrono

* Invoke SetNoCreate() method to reduce CPU usage drastically

* Remove setActive from static and motion transports

* Fix performance issues

* Added SetFarVisible to WG and some dungeon scripts

- Also removed setActive(true) from creatures in Wintergrasp. As for gameobjects they are set to active upon being damaged/destroyed and removed from active on rebuild (reset)

* Removed comments related to VISIBILITY_COMPENSATION

* Fix log

* Deleted unused files + corrected a check

* Added missing header

* Removed unused parameter

* Removed another unsued parameter

* Changed vector to set for i_visibleNow

- Changed vector to set for i_visibleNow in VisibleNotifer
- Adjusted HaveAtClient to accept Object*
- Adjusted SendUpdateToPlayer to send createobject packet only if not known to client
---
 src/server/game/Battlefield/Battlefield.cpp   |   4 +-
 .../game/Battlefield/Zones/BattlefieldWG.h    |   9 +
 .../game/Entities/Creature/Creature.cpp       |  28 ++-
 src/server/game/Entities/Creature/Creature.h  |   1 +
 .../Entities/DynamicObject/DynamicObject.cpp  |  19 +-
 .../game/Entities/GameObject/GameObject.cpp   |  58 +++---
 .../game/Entities/GameObject/GameObject.h     |   2 -
 src/server/game/Entities/Object/Object.cpp    | 107 ++++-------
 src/server/game/Entities/Object/Object.h      |   9 +-
 .../game/Entities/Object/ObjectDefines.h      |   4 -
 src/server/game/Entities/Object/ObjectGuid.h  |   1 +
 src/server/game/Entities/Player/Player.cpp    |  22 +--
 src/server/game/Entities/Player/Player.h      |  13 +-
 .../game/Entities/Player/PlayerUpdates.cpp    |  37 ++--
 .../game/Entities/Transport/Transport.cpp     |  65 ++++---
 .../game/Entities/Transport/Transport.h       |   3 -
 src/server/game/Entities/Unit/Unit.cpp        |  60 +++----
 src/server/game/Entities/Unit/Unit.h          |   2 +-
 src/server/game/Entities/Vehicle/Vehicle.cpp  |   3 +-
 src/server/game/Grids/NGrid.cpp               |   2 +-
 src/server/game/Grids/NGrid.h                 |   8 +-
 .../game/Grids/Notifiers/GridNotifiers.cpp    |   2 +-
 .../game/Grids/Notifiers/GridNotifiers.h      |  12 +-
 .../game/Grids/Notifiers/GridNotifiersImpl.h  |   4 -
 src/server/game/Grids/ObjectGridLoader.cpp    |  25 ++-
 src/server/game/Handlers/MovementHandler.cpp  | 167 +++++++++---------
 src/server/game/Maps/Map.cpp                  | 138 +++++++--------
 src/server/game/Maps/Map.h                    |  34 ++--
 src/server/game/Maps/MapInstanced.cpp         |  12 +-
 src/server/game/Maps/MapInstanced.h           |   2 +-
 src/server/game/Maps/MapMgr.cpp               |   4 +-
 src/server/game/Maps/TransportMgr.cpp         |   2 -
 src/server/game/Misc/DynamicVisibility.cpp    |  28 ---
 src/server/game/Misc/DynamicVisibility.h      |  58 ------
 .../game/Movement/Spline/MoveSpline.cpp       |  46 ++++-
 .../game/Movement/Spline/MoveSplineInit.cpp   |   1 +
 .../Movement/Spline/MovementPacketBuilder.cpp |  27 +--
 .../Movement/Spline/MovementPacketBuilder.h   |   1 +
 src/server/game/Movement/Spline/Spline.cpp    |  20 ++-
 src/server/game/Movement/Spline/Spline.h      |  21 +--
 .../game/Spells/Auras/SpellAuraEffects.cpp    |   2 +-
 src/server/game/Spells/SpellEffects.cpp       |   6 +-
 src/server/game/World/World.cpp               |   3 -
 .../BlackwingLair/boss_nefarian.cpp           |   1 +
 .../BlackwingLair/instance_blackwing_lair.cpp |   1 +
 .../Karazhan/boss_nightbane.cpp               |   1 +
 .../zone_the_scarlet_enclave.cpp              |   1 +
 .../BattleForMountHyjal/hyjalAI.cpp           |   8 +
 .../boss_baltharus_the_warborn.cpp            |   1 +
 .../IcecrownCitadel/boss_sindragosa.cpp       |   7 +
 .../Ulduar/boss_algalon_the_observer.cpp      |   1 +
 .../Ulduar/Ulduar/boss_razorscale.cpp         |   1 +
 .../Northrend/Ulduar/Ulduar/boss_thorim.cpp   |   1 +
 53 files changed, 509 insertions(+), 586 deletions(-)
 delete mode 100644 src/server/game/Misc/DynamicVisibility.cpp
 delete mode 100644 src/server/game/Misc/DynamicVisibility.h

diff --git a/src/server/game/Battlefield/Battlefield.cpp b/src/server/game/Battlefield/Battlefield.cpp
index fe609ea1f575d9..6750106554e83a 100644
--- a/src/server/game/Battlefield/Battlefield.cpp
+++ b/src/server/game/Battlefield/Battlefield.cpp
@@ -815,7 +815,7 @@ Creature* Battlefield::SpawnCreature(uint32 entry, float x, float y, float z, fl
 
     // Set creature in world
     map->AddToMap(creature);
-    creature->setActive(true);
+    creature->SetFarVisible(true);
 
     return creature;
 }
@@ -840,7 +840,7 @@ GameObject* Battlefield::SpawnGameObject(uint32 entry, float x, float y, float z
 
     // Add to world
     map->AddToMap(go);
-    go->setActive(true);
+    go->SetFarVisible(true);
 
     return go;
 }
diff --git a/src/server/game/Battlefield/Zones/BattlefieldWG.h b/src/server/game/Battlefield/Zones/BattlefieldWG.h
index 1c4cb586d2ce40..c0652d87824477 100644
--- a/src/server/game/Battlefield/Zones/BattlefieldWG.h
+++ b/src/server/game/Battlefield/Zones/BattlefieldWG.h
@@ -1159,6 +1159,7 @@ struct BfWGGameObjectBuilding
             // Rebuild gameobject
             go->SetDestructibleState(GO_DESTRUCTIBLE_REBUILDING, nullptr, true);
             go->SetUInt32Value(GAMEOBJECT_FACTION, WintergraspFaction[m_Team]);
+            go->setActive(false); // Everything is reset, no need keep active at this point.
         }
 
         // Update worldstate
@@ -1170,6 +1171,10 @@ struct BfWGGameObjectBuilding
     // Called when associated gameobject is damaged
     void Damaged()
     {
+        GameObject* go = m_WG->GetGameObject(m_Build);
+        if (go)
+            go->setActive(true);
+
         // Update worldstate
         m_State = BATTLEFIELD_WG_OBJECTSTATE_ALLIANCE_DAMAGE - (m_Team * 3);
         m_WG->SendUpdateWorldState(m_WorldState, m_State);
@@ -1193,6 +1198,10 @@ struct BfWGGameObjectBuilding
     // Called when associated gameobject is destroyed
     void Destroyed()
     {
+        GameObject* go = m_WG->GetGameObject(m_Build);
+        if (go)
+            go->setActive(true);
+
         // Update worldstate
         m_State = BATTLEFIELD_WG_OBJECTSTATE_ALLIANCE_DESTROY - (m_Team * 3);
         m_WG->SendUpdateWorldState(m_WorldState, m_State);
diff --git a/src/server/game/Entities/Creature/Creature.cpp b/src/server/game/Entities/Creature/Creature.cpp
index fb0ec895460b98..1d2ef9dfb6526b 100644
--- a/src/server/game/Entities/Creature/Creature.cpp
+++ b/src/server/game/Entities/Creature/Creature.cpp
@@ -301,9 +301,6 @@ void Creature::RemoveFromWorld()
         if (m_formation)
             sFormationMgr->RemoveCreatureFromGroup(m_formation, this);
 
-        if (Transport* transport = GetTransport())
-            transport->RemovePassenger(this, true);
-
         Unit::RemoveFromWorld();
 
         if (m_spawnId)
@@ -1826,7 +1823,25 @@ void Creature::DeleteFromDB()
         return;
     }
 
-    GetMap()->RemoveCreatureRespawnTime(m_spawnId);
+    CreatureData const* data = sObjectMgr->GetCreatureData(m_spawnId);
+    if (!data)
+        return;
+
+    CharacterDatabaseTransaction charTrans = CharacterDatabase.BeginTransaction();
+
+    sMapMgr->DoForAllMapsWithMapId(data->mapid,
+        [this, charTrans](Map* map) -> void
+        {
+            // despawn all active creatures, and remove their respawns
+            std::vector<Creature*> toUnload;
+            for (auto const& pair : Acore::Containers::MapEqualRange(map->GetCreatureBySpawnIdStore(), m_spawnId))
+                toUnload.push_back(pair.second);
+            for (Creature* creature : toUnload)
+                map->AddObjectToRemoveList(creature);
+            map->RemoveCreatureRespawnTime(m_spawnId);
+        }
+    );
+
     sObjectMgr->DeleteCreatureData(m_spawnId);
 
     WorldDatabaseTransaction trans = WorldDatabase.BeginTransaction();
@@ -3060,10 +3075,7 @@ std::string const& Creature::GetNameForLocaleIdx(LocaleConstant loc_idx) const
 
 void Creature::SetPosition(float x, float y, float z, float o)
 {
-    if (!Acore::IsValidMapCoord(x, y, z, o))
-        return;
-
-    GetMap()->CreatureRelocation(this, x, y, z, o);
+    UpdatePosition(x, y, z, o, false);
 }
 
 bool Creature::IsDungeonBoss() const
diff --git a/src/server/game/Entities/Creature/Creature.h b/src/server/game/Entities/Creature/Creature.h
index ede229ff781dcc..126b7b099f1077 100644
--- a/src/server/game/Entities/Creature/Creature.h
+++ b/src/server/game/Entities/Creature/Creature.h
@@ -68,6 +68,7 @@ class Creature : public Unit, public GridObject<Creature>, public MovableMapObje
 
     void Update(uint32 time) override;                         // overwrited Unit::Update
     void GetRespawnPosition(float& x, float& y, float& z, float* ori = nullptr, float* dist = nullptr) const;
+    bool IsSpawnedOnTransport() const { return m_creatureData && m_creatureData->mapid != GetMapId(); }
 
     void SetCorpseDelay(uint32 delay) { m_corpseDelay = delay; }
     void SetCorpseRemoveTime(uint32 delay);
diff --git a/src/server/game/Entities/DynamicObject/DynamicObject.cpp b/src/server/game/Entities/DynamicObject/DynamicObject.cpp
index 779e44312458ca..8346d74e8bbcb3 100644
--- a/src/server/game/Entities/DynamicObject/DynamicObject.cpp
+++ b/src/server/game/Entities/DynamicObject/DynamicObject.cpp
@@ -47,14 +47,6 @@ DynamicObject::~DynamicObject()
 
 void DynamicObject::CleanupsBeforeDelete(bool finalCleanup /* = true */)
 {
-    if (Transport* transport = GetTransport())
-    {
-        transport->RemovePassenger(this);
-        SetTransport(nullptr);
-        m_movementInfo.transport.Reset();
-        m_movementInfo.RemoveMovementFlag(MOVEMENTFLAG_ONTRANSPORT);
-    }
-
     WorldObject::CleanupsBeforeDelete(finalCleanup);
 }
 
@@ -88,9 +80,6 @@ void DynamicObject::RemoveFromWorld()
 
         UnbindFromCaster();
 
-        if (Transport* transport = GetTransport())
-            transport->RemovePassenger(this, true);
-
         WorldObject::RemoveFromWorld();
 
         GetMap()->GetObjectsStore().Remove<DynamicObject>(GetGUID());
@@ -125,17 +114,15 @@ bool DynamicObject::CreateDynamicObject(ObjectGuid::LowType guidlow, Unit* caste
     SetFloatValue(DYNAMICOBJECT_RADIUS, radius);
     SetUInt32Value(DYNAMICOBJECT_CASTTIME, GameTime::GetGameTimeMS().count());
 
+    if (IsWorldObject())
+        setActive(true);    //must before add to map to be put in world container
+
     if (!GetMap()->AddToMap(this, true))
     {
         // Returning false will cause the object to be deleted - remove from transport
         return false;
     }
 
-    if (IsWorldObject())
-    {
-        setActive(true);
-    }
-
     return true;
 }
 
diff --git a/src/server/game/Entities/GameObject/GameObject.cpp b/src/server/game/Entities/GameObject/GameObject.cpp
index aa164d4f75f94a..68b215377042d8 100644
--- a/src/server/game/Entities/GameObject/GameObject.cpp
+++ b/src/server/game/Entities/GameObject/GameObject.cpp
@@ -27,6 +27,7 @@
 #include "GridNotifiersImpl.h"
 #include "Group.h"
 #include "GroupMgr.h"
+#include "MapMgr.h"
 #include "ObjectMgr.h"
 #include "OutdoorPvPMgr.h"
 #include "PoolMgr.h"
@@ -102,18 +103,9 @@ std::string const& GameObject::GetAIName() const
     return sObjectMgr->GetGameObjectTemplate(GetEntry())->AIName;
 }
 
-void GameObject::CleanupsBeforeDelete(bool /*finalCleanup*/)
+void GameObject::CleanupsBeforeDelete(bool finalCleanup)
 {
-    if (GetTransport() && !ToTransport())
-    {
-        GetTransport()->RemovePassenger(this);
-        SetTransport(nullptr);
-        m_movementInfo.transport.Reset();
-        m_movementInfo.RemoveMovementFlag(MOVEMENTFLAG_ONTRANSPORT);
-    }
-
-    if (IsInWorld())
-        RemoveFromWorld();
+    WorldObject::CleanupsBeforeDelete(finalCleanup);
 
     if (m_uint32Values)                                      // field array can be not exist if GameOBject not loaded
         RemoveFromOwner();
@@ -182,9 +174,6 @@ void GameObject::RemoveFromWorld()
             if (GetMap()->ContainsGameObjectModel(*m_model))
                 GetMap()->RemoveGameObjectModel(*m_model);
 
-        if (Transport* transport = GetTransport())
-            transport->RemovePassenger(this, true);
-
         // If linked trap exists, despawn it
         if (GameObject* linkedTrap = GetLinkedTrap())
         {
@@ -888,7 +877,11 @@ void GameObject::Update(uint32 diff)
                 if (!m_spawnedByDefault)
                 {
                     m_respawnTime = 0;
-                    DestroyForNearbyPlayers(); // xinef: old UpdateObjectVisibility();
+                    if (m_spawnId)
+                        DestroyForNearbyPlayers(); // xinef: old UpdateObjectVisibility();
+                    else
+                        Delete();
+
                     return;
                 }
 
@@ -1184,7 +1177,31 @@ bool GameObject::LoadGameObjectFromDB(ObjectGuid::LowType spawnId, Map* map, boo
 
 void GameObject::DeleteFromDB()
 {
-    GetMap()->RemoveGORespawnTime(m_spawnId);
+    if (!m_spawnId)
+    {
+        LOG_ERROR("entities.gameobject", "Trying to delete not saved gameobject: {}", GetGUID().ToString());
+        return;
+    }
+
+    GameObjectData const* data = sObjectMgr->GetGameObjectData(m_spawnId);
+    if (!data)
+        return;
+
+    CharacterDatabaseTransaction charTrans = CharacterDatabase.BeginTransaction();
+
+    sMapMgr->DoForAllMapsWithMapId(data->mapid,
+        [this, charTrans](Map* map) -> void
+        {
+            // despawn all active objects, and remove their respawns
+            std::vector<GameObject*> toUnload;
+            for (auto const& pair : Acore::Containers::MapEqualRange(map->GetGameObjectBySpawnIdStore(), m_spawnId))
+                toUnload.push_back(pair.second);
+            for (GameObject* obj : toUnload)
+                map->AddObjectToRemoveList(obj);
+            map->RemoveGORespawnTime(m_spawnId);
+        }
+    );
+
     sObjectMgr->DeleteGOData(m_spawnId);
 
     WorldDatabasePreparedStatement* stmt = WorldDatabase.GetPreparedStatement(WORLD_DEL_GAMEOBJECT);
@@ -2173,15 +2190,6 @@ bool GameObject::IsInRange(float x, float y, float z, float radius) const
            && dz < (info->maxZ * scale) + radius && dz > (info->minZ * scale) - radius;
 }
 
-void GameObject::SendMessageToSetInRange(WorldPacket const* data, float dist, bool /*self*/, bool includeMargin, Player const* skipped_rcvr) const
-{
-    dist += GetObjectSize();
-    if (includeMargin)
-        dist += VISIBILITY_COMPENSATION * 2.0f; // pussywizard: to ensure everyone receives all important packets
-    Acore::MessageDistDeliverer notifier(this, data, dist, false, skipped_rcvr);
-    Cell::VisitWorldObjects(this, notifier, dist);
-}
-
 void GameObject::EventInform(uint32 eventId)
 {
     if (!eventId)
diff --git a/src/server/game/Entities/GameObject/GameObject.h b/src/server/game/Entities/GameObject/GameObject.h
index 61962e75dd545c..945c648e03f317 100644
--- a/src/server/game/Entities/GameObject/GameObject.h
+++ b/src/server/game/Entities/GameObject/GameObject.h
@@ -289,8 +289,6 @@ class GameObject : public WorldObject, public GridObject<GameObject>, public Mov
     void SendCustomAnim(uint32 anim);
     [[nodiscard]] bool IsInRange(float x, float y, float z, float radius) const;
 
-    void SendMessageToSetInRange(WorldPacket const* data, float dist, bool /*self*/, bool includeMargin = false, Player const* skipped_rcvr = nullptr) const override; // pussywizard!
-
     void ModifyHealth(int32 change, Unit* attackerOrHealer = nullptr, uint32 spellId = 0);
     void SetDestructibleBuildingModifyState(bool allow) { m_allowModifyDestructibleBuilding = allow; }
     // sets GameObject type 33 destruction flags and optionally default health for that state
diff --git a/src/server/game/Entities/Object/Object.cpp b/src/server/game/Entities/Object/Object.cpp
index c0584ef005a6e8..97f90bdddd80f3 100644
--- a/src/server/game/Entities/Object/Object.cpp
+++ b/src/server/game/Entities/Object/Object.cpp
@@ -21,7 +21,6 @@
 #include "CellImpl.h"
 #include "Chat.h"
 #include "Creature.h"
-#include "DynamicVisibility.h"
 #include "GameObjectAI.h"
 #include "GameTime.h"
 #include "GridNotifiers.h"
@@ -249,7 +248,10 @@ void Object::SendUpdateToPlayer(Player* player)
     UpdateData upd;
     WorldPacket packet;
 
-    BuildCreateUpdateBlockForPlayer(&upd, player);
+    if (player->HaveAtClient(this))
+        BuildValuesUpdateBlockForPlayer(&upd, player);
+    else
+        BuildCreateUpdateBlockForPlayer(&upd, player);
     upd.BuildPacket(&packet);
     player->GetSession()->SendPacket(&packet);
 }
@@ -1048,7 +1050,7 @@ void MovementInfo::OutDebug()
 }
 
 WorldObject::WorldObject(bool isWorldObject) : WorldLocation(),
-    LastUsedScriptID(0), m_name(""), m_isActive(false), m_visibilityDistanceOverride(), m_isWorldObject(isWorldObject), m_zoneScript(nullptr),
+    LastUsedScriptID(0), m_name(""), m_isActive(false), m_isFarVisible(false), m_visibilityDistanceOverride(), m_isWorldObject(isWorldObject), m_zoneScript(nullptr),
     _zoneId(0), _areaId(0), _floorZ(INVALID_HEIGHT), _outdoors(false), _liquidData(), _updatePositionData(false), m_transport(nullptr),
     m_currMap(nullptr), m_InstanceId(0), m_phaseMask(PHASEMASK_NORMAL), m_useCombinedPhases(true), m_notifyflags(0), m_executed_notifies(0)
 {
@@ -1105,8 +1107,6 @@ void WorldObject::setActive(bool on)
             map->AddToActive(this->ToCreature());
         else if (GetTypeId() == TYPEID_DYNAMICOBJECT)
             map->AddToActive((DynamicObject*)this);
-        else if (GetTypeId() == TYPEID_GAMEOBJECT)
-            map->AddToActive((GameObject*)this);
     }
     else
     {
@@ -1114,11 +1114,17 @@ void WorldObject::setActive(bool on)
             map->RemoveFromActive(this->ToCreature());
         else if (GetTypeId() == TYPEID_DYNAMICOBJECT)
             map->RemoveFromActive((DynamicObject*)this);
-        else if (GetTypeId() == TYPEID_GAMEOBJECT)
-            map->RemoveFromActive((GameObject*)this);
     }
 }
 
+void WorldObject::SetFarVisible(bool on)
+{
+    if (GetTypeId() == TYPEID_PLAYER)
+        return;
+
+    m_isFarVisible = on;
+}
+
 void WorldObject::SetVisibilityDistanceOverride(VisibilityDistanceType type)
 {
     ASSERT(type < VisibilityDistanceType::Max);
@@ -1134,6 +1140,9 @@ void WorldObject::CleanupsBeforeDelete(bool /*finalCleanup*/)
 {
     if (IsInWorld())
         RemoveFromWorld();
+
+    if (Transport* transport = GetTransport())
+        transport->RemovePassenger(this, true);
 }
 
 void WorldObject::_Create(ObjectGuid::LowType guidlow, HighGuid guidhigh, uint32 phaseMask)
@@ -1626,9 +1635,9 @@ float WorldObject::GetGridActivationRange() const
     {
         if (ToPlayer()->GetCinematicMgr()->IsOnCinematic())
         {
-            return DEFAULT_VISIBILITY_INSTANCE;
+            return std::max(DEFAULT_VISIBILITY_INSTANCE, GetMap()->GetVisibilityRange());
         }
-        return IsInWintergrasp() ? VISIBILITY_DIST_WINTERGRASP : GetMap()->GetVisibilityRange();
+        return IsInWintergrasp() ? VISIBILITY_DISTANCE_LARGE : GetMap()->GetVisibilityRange();
     }
     else if (ToCreature())
     {
@@ -1644,29 +1653,12 @@ float WorldObject::GetGridActivationRange() const
 
 float WorldObject::GetVisibilityRange() const
 {
-    if (IsVisibilityOverridden() && GetTypeId() == TYPEID_UNIT)
-    {
+    if (IsVisibilityOverridden() && !ToPlayer())
         return *m_visibilityDistanceOverride;
-    }
-    else if (GetTypeId() == TYPEID_GAMEOBJECT)
-    {
-        {
-            if (IsInWintergrasp())
-            {
-                return VISIBILITY_DIST_WINTERGRASP + VISIBILITY_INC_FOR_GOBJECTS;
-            }
-            else if (IsVisibilityOverridden())
-            {
-                return *m_visibilityDistanceOverride;
-            }
-            else
-            {
-                return GetMap()->GetVisibilityRange() + VISIBILITY_INC_FOR_GOBJECTS;
-            }
-        }
-    }
+    else if (IsFarVisible() && !ToPlayer())
+        return MAX_VISIBILITY_DISTANCE;
     else
-        return IsInWintergrasp() ? VISIBILITY_DIST_WINTERGRASP : GetMap()->GetVisibilityRange();
+        return IsInWintergrasp() ? VISIBILITY_DISTANCE_LARGE : GetMap()->GetVisibilityRange();
 }
 
 float WorldObject::GetSightRange(WorldObject const* target) const
@@ -1675,44 +1667,19 @@ float WorldObject::GetSightRange(WorldObject const* target) const
     {
         if (ToPlayer())
         {
-            if (target)
-            {
-                if (target->IsVisibilityOverridden() && target->GetTypeId() == TYPEID_UNIT)
-                {
-                    return *target->m_visibilityDistanceOverride;
-                }
-                else if (target->GetTypeId() == TYPEID_GAMEOBJECT)
-                {
-                    if (IsInWintergrasp() && target->IsInWintergrasp())
-                    {
-                        return VISIBILITY_DIST_WINTERGRASP + VISIBILITY_INC_FOR_GOBJECTS;
-                    }
-                    else if (target->IsVisibilityOverridden())
-                    {
-                        return *target->m_visibilityDistanceOverride;
-                    }
-                    else if (ToPlayer()->GetCinematicMgr()->IsOnCinematic())
-                    {
-                        return DEFAULT_VISIBILITY_INSTANCE;
-                    }
-                    else
-                    {
-                        return GetMap()->GetVisibilityRange() + VISIBILITY_INC_FOR_GOBJECTS;
-                    }
-                }
-
-                return IsInWintergrasp() && target->IsInWintergrasp() ? VISIBILITY_DIST_WINTERGRASP : GetMap()->GetVisibilityRange();
-            }
-            return IsInWintergrasp() ? VISIBILITY_DIST_WINTERGRASP : GetMap()->GetVisibilityRange();
+            if (target && target->IsVisibilityOverridden() && !target->ToPlayer())
+                return *target->m_visibilityDistanceOverride;
+            else if (target && target->IsFarVisible() && !target->ToPlayer())
+                return MAX_VISIBILITY_DISTANCE;
+            else if (ToPlayer()->GetCinematicMgr()->IsOnCinematic())
+                return DEFAULT_VISIBILITY_INSTANCE;
+            else
+                return IsInWintergrasp() ? VISIBILITY_DISTANCE_LARGE : GetMap()->GetVisibilityRange();
         }
         else if (ToCreature())
-        {
             return ToCreature()->m_SightDistance;
-        }
         else
-        {
             return SIGHT_RANGE_UNIT;
-        }
     }
 
     if (ToDynObject() && isActiveObject())
@@ -2077,11 +2044,8 @@ void Unit::BuildHeartBeatMsg(WorldPacket* data) const
     BuildMovementPacket(data);
 }
 
-void WorldObject::SendMessageToSetInRange(WorldPacket const* data, float dist, bool /*self*/, bool includeMargin, Player const* skipped_rcvr) const
+void WorldObject::SendMessageToSetInRange(WorldPacket const* data, float dist, bool /*self*/, Player const* skipped_rcvr) const
 {
-    dist += GetObjectSize();
-    if (includeMargin)
-        dist += VISIBILITY_COMPENSATION; // pussywizard: to ensure everyone receives all important packets
     Acore::MessageDistDeliverer notifier(this, data, dist, false, skipped_rcvr);
     Cell::VisitWorldObjects(this, notifier, dist);
 }
@@ -2228,7 +2192,8 @@ TempSummon* Map::SummonCreature(uint32 entry, Position const& pos, SummonPropert
             return nullptr;
     }
 
-    EnsureGridLoaded(Cell(pos.GetPositionX(), pos.GetPositionY()));
+    if (!IsGridLoaded(pos.GetPositionX(), pos.GetPositionY()))
+        EnsureGridLoaded(Cell(pos.GetPositionX(), pos.GetPositionY()));
     if (!summon->Create(GenerateLowGuid<HighGuid::Unit>(), this, phase, entry, vehId, pos.GetPositionX(), pos.GetPositionY(), pos.GetPositionZ(), pos.GetOrientation()))
     {
         delete summon;
@@ -2901,8 +2866,8 @@ void WorldObject::DestroyForNearbyPlayers()
         return;
 
     std::list<Player*> targets;
-    Acore::AnyPlayerInObjectRangeCheck check(this, GetVisibilityRange() + VISIBILITY_COMPENSATION, false);
-    Acore::PlayerListSearcherWithSharedVision<Acore::AnyPlayerInObjectRangeCheck> searcher(this, targets, check);
+    Acore::AnyPlayerInObjectRangeCheck check(this, GetVisibilityRange(), false);
+    Acore::PlayerListSearcher<Acore::AnyPlayerInObjectRangeCheck> searcher(this, targets, check);
     Cell::VisitWorldObjects(this, searcher, GetVisibilityRange());
     for (std::list<Player*>::const_iterator iter = targets.begin(); iter != targets.end(); ++iter)
     {
@@ -2984,7 +2949,7 @@ struct WorldObjectChangeAccumulator
             source = iter->GetSource();
             ObjectGuid guid = source->GetCasterGUID();
 
-            if (guid)
+            if (guid.IsPlayer())
             {
                 //Caster may be nullptr if DynObj is in removelist
                 if (Player* caster = ObjectAccessor::FindPlayer(guid))
diff --git a/src/server/game/Entities/Object/Object.h b/src/server/game/Entities/Object/Object.h
index adaf92899d8887..5ee201e8e13ebe 100644
--- a/src/server/game/Entities/Object/Object.h
+++ b/src/server/game/Entities/Object/Object.h
@@ -488,9 +488,9 @@ class WorldObject : public Object, public WorldLocation
 
     virtual void CleanupsBeforeDelete(bool finalCleanup = true);  // used in destructor or explicitly before mass creature delete to remove cross-references to already deleted units
 
-    virtual void SendMessageToSet(WorldPacket const* data, bool self) const { if (IsInWorld()) SendMessageToSetInRange(data, GetVisibilityRange(), self, true); } // pussywizard!
-    virtual void SendMessageToSetInRange(WorldPacket const* data, float dist, bool /*self*/, bool includeMargin = false, Player const* skipped_rcvr = nullptr) const; // pussywizard!
-    virtual void SendMessageToSet(WorldPacket const* data, Player const* skipped_rcvr) const { if (IsInWorld()) SendMessageToSetInRange(data, GetVisibilityRange(), false, true, skipped_rcvr); } // pussywizard!
+    virtual void SendMessageToSet(WorldPacket const* data, bool self) const { if (IsInWorld()) SendMessageToSetInRange(data, GetVisibilityRange(), self); } // pussywizard!
+    virtual void SendMessageToSetInRange(WorldPacket const* data, float dist, bool /*self*/, Player const* skipped_rcvr = nullptr) const; // pussywizard!
+    virtual void SendMessageToSet(WorldPacket const* data, Player const* skipped_rcvr) const { if (IsInWorld()) SendMessageToSetInRange(data, GetVisibilityRange(), false, skipped_rcvr); } // pussywizard!
 
     virtual uint8 getLevelForTarget(WorldObject const* /*target*/) const { return 1; }
 
@@ -569,6 +569,7 @@ class WorldObject : public Object, public WorldLocation
     [[nodiscard]] bool isActiveObject() const { return m_isActive; }
     void setActive(bool isActiveObject);
     [[nodiscard]] bool IsFarVisible() const { return m_isFarVisible; }
+    void SetFarVisible(bool on);
     [[nodiscard]] bool IsVisibilityOverridden() const { return m_visibilityDistanceOverride.has_value(); }
     void SetVisibilityDistanceOverride(VisibilityDistanceType type);
     void SetWorldObject(bool apply);
@@ -577,7 +578,7 @@ class WorldObject : public Object, public WorldLocation
 
     [[nodiscard]] bool IsInWintergrasp() const
     {
-        return GetMapId() == 571 && GetPositionX() > 3733.33331f && GetPositionX() < 5866.66663f && GetPositionY() > 1599.99999f && GetPositionY() < 4799.99997f;
+        return GetMapId() == 571 && GetZoneId() == 4197;
     }
 
 #ifdef MAP_BASED_RAND_GEN
diff --git a/src/server/game/Entities/Object/ObjectDefines.h b/src/server/game/Entities/Object/ObjectDefines.h
index 5d809c05f58b58..0dfb5a7053e928 100644
--- a/src/server/game/Entities/Object/ObjectDefines.h
+++ b/src/server/game/Entities/Object/ObjectDefines.h
@@ -23,10 +23,7 @@
 #define CONTACT_DISTANCE             0.5f
 #define INTERACTION_DISTANCE         5.5f
 #define ATTACK_DISTANCE              5.0f
-#define VISIBILITY_COMPENSATION      15.0f                  // increase searchers
 #define INSPECT_DISTANCE             28.0f
-#define VISIBILITY_INC_FOR_GOBJECTS  30.0f                  // pussywizard
-#define SPELL_SEARCHER_COMPENSATION  30.0f                  // increase searchers size in case we have large npc near cell border
 #define TRADE_DISTANCE               11.11f
 #define MAX_VISIBILITY_DISTANCE      SIZE_OF_GRIDS                 // max distance for visible objects, experimental
 #define SIGHT_RANGE_UNIT             50.0f
@@ -38,7 +35,6 @@
 #define VISIBILITY_DISTANCE_TINY     25.0f
 #define DEFAULT_VISIBILITY_DISTANCE  VISIBILITY_DISTANCE_NORMAL                 // default visible distance, 100 yards on continents
 #define DEFAULT_VISIBILITY_INSTANCE  170.0f                 // default visible distance in instances, 170 yards
-#define VISIBILITY_DIST_WINTERGRASP  175.0f
 #define DEFAULT_VISIBILITY_BGARENAS  533.0f                 // default visible distance in BG/Arenas, roughly 533 yards
 
 #define DEFAULT_WORLD_OBJECT_SIZE   0.388999998569489f      // player size, also currently used (correctly?) for any non Unit world objects
diff --git a/src/server/game/Entities/Object/ObjectGuid.h b/src/server/game/Entities/Object/ObjectGuid.h
index bb8029048ae086..3f626c780594f4 100644
--- a/src/server/game/Entities/Object/ObjectGuid.h
+++ b/src/server/game/Entities/Object/ObjectGuid.h
@@ -134,6 +134,7 @@ class ObjectGuid
         ObjectGuid(HighGuid hi, uint32 entry, LowType counter) : _guid(counter ? uint64(counter) | (uint64(entry) << 24) | (uint64(hi) << 48) : 0) { }
         ObjectGuid(HighGuid hi, LowType counter) : _guid(counter ? uint64(counter) | (uint64(hi) << 48) : 0) { }
 
+        operator uint64() const { return _guid; }
         PackedGuidReader ReadAsPacked() { return PackedGuidReader(*this); }
 
         void Set(uint64 guid) { _guid = guid; }
diff --git a/src/server/game/Entities/Player/Player.cpp b/src/server/game/Entities/Player/Player.cpp
index 14adb01c826c79..bc64ae0a385674 100644
--- a/src/server/game/Entities/Player/Player.cpp
+++ b/src/server/game/Entities/Player/Player.cpp
@@ -1353,10 +1353,7 @@ bool Player::TeleportTo(uint32 mapid, float x, float y, float z, float orientati
 
         if (GetTransport())
         {
-            m_transport->RemovePassenger(this);
-            m_transport = nullptr;
-            m_movementInfo.transport.Reset();
-            m_movementInfo.RemoveMovementFlag(MOVEMENTFLAG_ONTRANSPORT);
+            m_transport->RemovePassenger(this, true);
             RepopAtGraveyard();                             // teleport to near graveyard if on transport, looks blizz like :)
         }
 
@@ -1398,10 +1395,7 @@ bool Player::TeleportTo(uint32 mapid, float x, float y, float z, float orientati
             AddUnitMovementFlag(MOVEMENTFLAG_ONTRANSPORT);
         else
         {
-            m_transport->RemovePassenger(this);
-            m_transport = nullptr;
-            m_movementInfo.transport.Reset();
-            m_movementInfo.RemoveMovementFlag(MOVEMENTFLAG_ONTRANSPORT);
+            m_transport->RemovePassenger(this, true);
         }
     }
 
@@ -5581,14 +5575,11 @@ void Player::SaveRecallPosition()
     m_recallO = GetOrientation();
 }
 
-void Player::SendMessageToSetInRange(WorldPacket const* data, float dist, bool self, bool includeMargin, Player const* skipped_rcvr) const
+void Player::SendMessageToSetInRange(WorldPacket const* data, float dist, bool self, Player const* skipped_rcvr) const
 {
     if (self)
         GetSession()->SendPacket(data);
 
-    dist += GetObjectSize();
-    if (includeMargin)
-        dist += VISIBILITY_COMPENSATION; // pussywizard: to ensure everyone receives all important packets
     Acore::MessageDistDeliverer notifier(this, data, dist, false, skipped_rcvr);
     Cell::VisitWorldObjects(this, notifier, dist);
 }
@@ -11322,7 +11313,7 @@ WorldLocation Player::GetStartPosition() const
     return WorldLocation(mapId, info->positionX, info->positionY, info->positionZ, 0);
 }
 
-bool Player::HaveAtClient(WorldObject const* u) const
+bool Player::HaveAtClient(Object const* u) const
 {
     if (u == this)
     {
@@ -13096,14 +13087,11 @@ void Player::SetViewpoint(WorldObject* target, bool apply)
         UpdateVisibilityOf(target);
 
         if (target->isType(TYPEMASK_UNIT) && !GetVehicle())
-            ((Unit*)target)->AddPlayerToVision(this);
+            static_cast<Unit*>(target)->AddPlayerToVision(this);
         SetSeer(target);
     }
     else
     {
-        //must immediately set seer back otherwise may crash
-        m_seer = this;
-
         LOG_DEBUG("maps", "Player::CreateViewpoint: Player {} remove seer", GetName());
 
         if (!RemoveGuidValue(PLAYER_FARSIGHT, target->GetGUID()))
diff --git a/src/server/game/Entities/Player/Player.h b/src/server/game/Entities/Player/Player.h
index bb4b0585c52009..c36fec2950961f 100644
--- a/src/server/game/Entities/Player/Player.h
+++ b/src/server/game/Entities/Player/Player.h
@@ -1986,10 +1986,10 @@ class Player : public Unit, public GridObject<Player>
 
     void ProcessTerrainStatusUpdate() override;
 
-    void SendMessageToSet(WorldPacket const* data, bool self) const override { SendMessageToSetInRange(data, GetVisibilityRange(), self, true); } // pussywizard!
-    void SendMessageToSetInRange(WorldPacket const* data, float dist, bool self, bool includeMargin = false, Player const* skipped_rcvr = nullptr) const override; // pussywizard!
-    void SendMessageToSetInRange_OwnTeam(WorldPacket const* data, float dist, bool self) const; // pussywizard! param includeMargin not needed here
-    void SendMessageToSet(WorldPacket const* data, Player const* skipped_rcvr) const override { SendMessageToSetInRange(data, GetVisibilityRange(), skipped_rcvr != this, true, skipped_rcvr); } // pussywizard!
+    void SendMessageToSet(WorldPacket const* data, bool self) const override { SendMessageToSetInRange(data, GetVisibilityRange(), self); } // pussywizard!
+    void SendMessageToSetInRange(WorldPacket const* data, float dist, bool self, Player const* skipped_rcvr = nullptr) const override; // pussywizard!
+    void SendMessageToSetInRange_OwnTeam(WorldPacket const* data, float dist, bool self) const; // pussywizard!
+    void SendMessageToSet(WorldPacket const* data, Player const* skipped_rcvr) const override { SendMessageToSetInRange(data, GetVisibilityRange(), skipped_rcvr != this, skipped_rcvr); } // pussywizard!
 
     void SendTeleportAckPacket();
 
@@ -2342,9 +2342,8 @@ class Player : public Unit, public GridObject<Player>
 
     // currently visible objects at player client
     GuidUnorderedSet m_clientGUIDs;
-    std::vector<Unit*> m_newVisible; // pussywizard
 
-    [[nodiscard]] bool HaveAtClient(WorldObject const* u) const;
+    [[nodiscard]] bool HaveAtClient(Object const* u) const;
     [[nodiscard]] bool HaveAtClient(ObjectGuid guid) const;
 
     [[nodiscard]] bool IsNeverVisible() const override;
@@ -2358,7 +2357,7 @@ class Player : public Unit, public GridObject<Player>
     void UpdateTriggerVisibility();
 
     template<class T>
-    void UpdateVisibilityOf(T* target, UpdateData& data, std::vector<Unit*>& visibleNow);
+    void UpdateVisibilityOf(T* target, UpdateData& data, std::set<Unit*>& visibleNow);
 
     uint8 m_forced_speed_changes[MAX_MOVE_TYPE];
 
diff --git a/src/server/game/Entities/Player/PlayerUpdates.cpp b/src/server/game/Entities/Player/PlayerUpdates.cpp
index 17c1319f9a4090..f36708d46e6b2c 100644
--- a/src/server/game/Entities/Player/PlayerUpdates.cpp
+++ b/src/server/game/Entities/Player/PlayerUpdates.cpp
@@ -1521,17 +1521,11 @@ void Player::UpdatePotionCooldown(Spell* spell)
     SetLastPotionId(0);
 }
 
-template void Player::UpdateVisibilityOf(Player* target, UpdateData& data,
-                                         std::vector<Unit*>& visibleNow);
-template void Player::UpdateVisibilityOf(Creature* target, UpdateData& data,
-                                         std::vector<Unit*>& visibleNow);
-template void Player::UpdateVisibilityOf(Corpse* target, UpdateData& data,
-                                         std::vector<Unit*>& visibleNow);
-template void Player::UpdateVisibilityOf(GameObject* target, UpdateData& data,
-                                         std::vector<Unit*>& visibleNow);
-template void Player::UpdateVisibilityOf(DynamicObject*      target,
-                                         UpdateData&         data,
-                                         std::vector<Unit*>& visibleNow);
+template void Player::UpdateVisibilityOf(Player* target, UpdateData& data, std::set<Unit*>& visibleNow);
+template void Player::UpdateVisibilityOf(Creature* target, UpdateData& data, std::set<Unit*>& visibleNow);
+template void Player::UpdateVisibilityOf(Corpse* target, UpdateData& data, std::set<Unit*>& visibleNow);
+template void Player::UpdateVisibilityOf(GameObject* target, UpdateData& data, std::set<Unit*>& visibleNow);
+template void Player::UpdateVisibilityOf(DynamicObject* target, UpdateData& data, std::set<Unit*>& visibleNow);
 
 void Player::UpdateVisibilityForPlayer(bool mapChange)
 {
@@ -1543,7 +1537,7 @@ void Player::UpdateVisibilityForPlayer(bool mapChange)
     }
 
     // updates visibility of all objects around point of view for current player
-    Acore::VisibleNotifier notifier(*this, mapChange);
+    Acore::VisibleNotifier notifier(*this);
     Cell::VisitAllObjects(m_seer, notifier, GetSightRange());
     notifier.SendToSelf();   // send gathered data
 }
@@ -1564,15 +1558,13 @@ void Player::UpdateObjectVisibility(bool forced)
 }
 
 template <class T>
-inline void UpdateVisibilityOf_helper(GuidUnorderedSet& s64, T* target,
-                                      std::vector<Unit*>& /*v*/)
+inline void UpdateVisibilityOf_helper(GuidUnorderedSet& s64, T* target, std::set<Unit*>& /*v*/)
 {
     s64.insert(target->GetGUID());
 }
 
 template <>
-inline void UpdateVisibilityOf_helper(GuidUnorderedSet& s64, GameObject* target,
-                                      std::vector<Unit*>& /*v*/)
+inline void UpdateVisibilityOf_helper(GuidUnorderedSet& s64, GameObject* target, std::set<Unit*>& /*v*/)
 {
     // @HACK: This is to prevent objects like deeprun tram from disappearing
     // when player moves far from its spawn point while riding it
@@ -1581,19 +1573,17 @@ inline void UpdateVisibilityOf_helper(GuidUnorderedSet& s64, GameObject* target,
 }
 
 template <>
-inline void UpdateVisibilityOf_helper(GuidUnorderedSet& s64, Creature* target,
-                                      std::vector<Unit*>& v)
+inline void UpdateVisibilityOf_helper(GuidUnorderedSet& s64, Creature* target, std::set<Unit*>& v)
 {
     s64.insert(target->GetGUID());
-    v.push_back(target);
+    v.insert(target);
 }
 
 template <>
-inline void UpdateVisibilityOf_helper(GuidUnorderedSet& s64, Player* target,
-                                      std::vector<Unit*>& v)
+inline void UpdateVisibilityOf_helper(GuidUnorderedSet& s64, Player* target, std::set<Unit*>& v)
 {
     s64.insert(target->GetGUID());
-    v.push_back(target);
+    v.insert(target);
 }
 
 template <class T>
@@ -1609,8 +1599,7 @@ inline void BeforeVisibilityDestroy<Creature>(Creature* t, Player* p)
 }
 
 template <class T>
-void Player::UpdateVisibilityOf(T* target, UpdateData& data,
-                                std::vector<Unit*>& visibleNow)
+void Player::UpdateVisibilityOf(T* target, UpdateData& data, std::set<Unit*>& visibleNow)
 {
     if (HaveAtClient(target))
     {
diff --git a/src/server/game/Entities/Transport/Transport.cpp b/src/server/game/Entities/Transport/Transport.cpp
index 3dc023eb49685e..3fb3e3b821508a 100644
--- a/src/server/game/Entities/Transport/Transport.cpp
+++ b/src/server/game/Entities/Transport/Transport.cpp
@@ -32,7 +32,7 @@
 #include "World.h"
 #include "WorldModel.h"
 
-MotionTransport::MotionTransport() : Transport(), _transportInfo(nullptr), _isMoving(true), _pendingStop(false), _triggeredArrivalEvent(false), _triggeredDepartureEvent(false), _passengersLoaded(false), _delayedTeleport(false)
+MotionTransport::MotionTransport() : Transport(), _transportInfo(nullptr), _isMoving(true), _pendingStop(false), _triggeredArrivalEvent(false), _triggeredDepartureEvent(false), _delayedTeleport(false)
 {
     m_updateFlag = UPDATEFLAG_TRANSPORT | UPDATEFLAG_LOWGUID | UPDATEFLAG_STATIONARY_POSITION | UPDATEFLAG_ROTATION;
 }
@@ -230,8 +230,14 @@ void MotionTransport::Update(uint32 diff)
               3. transport moves from active to inactive grid
               4. the grid that transport is currently in unloads
             */
-            if (_staticPassengers.empty() && GetMap()->IsGridLoaded(GetPositionX(), GetPositionY())) // 2.
+            bool gridActive = GetMap()->IsGridLoaded(GetPositionX(), GetPositionY());
+
+            if (_staticPassengers.empty() && gridActive) // 2.
                 LoadStaticPassengers();
+            else if (!_staticPassengers.empty() && !gridActive)
+                // 4. - if transports stopped on grid edge, some passengers can remain in active grids
+                //      unload all static passengers otherwise passengers won't load correctly when the grid that transport is currently in becomes active
+                UnloadStaticPassengers();
         }
     }
 
@@ -248,18 +254,27 @@ void MotionTransport::DelayedUpdate(uint32  /*diff*/)
 
 void MotionTransport::UpdatePosition(float x, float y, float z, float o)
 {
-    if (!GetMap()->IsGridLoaded(x, y)) // pussywizard: should not happen, but just in case
-        GetMap()->LoadGrid(x, y);
+    bool newActive = GetMap()->IsGridLoaded(x, y);
+    Cell oldCell(GetPositionX(), GetPositionY());
 
     Relocate(x, y, z, o);
     UpdateModelPosition();
 
     UpdatePassengerPositions(_passengers);
 
-    if (_staticPassengers.empty())
+    /* There are four possible scenarios that trigger loading/unloading passengers:
+      1. transport moves from inactive to active grid
+      2. the grid that transport is currently in becomes active
+      3. transport moves from active to inactive grid
+      4. the grid that transport is currently in unloads
+    */
+    if (_staticPassengers.empty() && newActive) // 1.
         LoadStaticPassengers();
+    else if (!_staticPassengers.empty() && !newActive && oldCell.DiffGrid(Cell(GetPositionX(), GetPositionY()))) // 3.
+        UnloadStaticPassengers();
     else
         UpdatePassengerPositions(_staticPassengers);
+    // 4. is handed by grid unload
 }
 
 void MotionTransport::AddPassenger(WorldObject* passenger, bool withAll)
@@ -306,8 +321,7 @@ void MotionTransport::RemovePassenger(WorldObject* passenger, bool withAll)
         {
             passenger->SetTransport(nullptr);
             passenger->m_movementInfo.flags &= ~MOVEMENTFLAG_ONTRANSPORT;
-            passenger->m_movementInfo.transport.guid.Clear();
-            passenger->m_movementInfo.transport.pos.Relocate(0.0f, 0.0f, 0.0f, 0.0f);
+            passenger->m_movementInfo.transport.Reset();
             if (passenger->ToUnit())
             {
                 passenger->ToUnit()->ClearUnitState(UNIT_STATE_IGNORE_PATHFINDING);
@@ -407,9 +421,6 @@ GameObject* MotionTransport::CreateGOPassenger(ObjectGuid::LowType guid, GameObj
 
 void MotionTransport::LoadStaticPassengers()
 {
-    if (PassengersLoaded())
-        return;
-    SetPassengersLoaded(true);
     if (uint32 mapId = GetGOInfo()->moTransport.mapID)
     {
         CellObjectGuidsMap const& cells = sObjectMgr->GetMapObjectGuids(mapId, GetMap()->GetSpawnMode());
@@ -431,7 +442,6 @@ void MotionTransport::LoadStaticPassengers()
 
 void MotionTransport::UnloadStaticPassengers()
 {
-    SetPassengersLoaded(false);
     while (!_staticPassengers.empty())
     {
         WorldObject* obj = *_staticPassengers.begin();
@@ -542,11 +552,19 @@ void MotionTransport::DelayedTeleportTransport()
     _delayedTeleport = false;
 
     uint32 newMapId = _nextFrame->Node->mapid;
+    Map* newMap = sMapMgr->CreateBaseMap(newMapId);
+    GetMap()->RemoveFromMap<MotionTransport>(this, false);
+
     float x = _nextFrame->Node->x,
           y = _nextFrame->Node->y,
           z = _nextFrame->Node->z,
           o = _nextFrame->InitialOrientation;
 
+    if (!newMap->IsGridLoaded(x, y) && !_passengers.empty())
+        newMap->LoadGrid(x, y); // xinef: load before adding passengers to new map
+
+    SetMap(newMap);
+
     PassengerSet _passengersCopy = _passengers;
     for (PassengerSet::iterator itr = _passengersCopy.begin(); itr != _passengersCopy.end(); )
     {
@@ -592,15 +610,8 @@ void MotionTransport::DelayedTeleportTransport()
         }
     }
 
-    Map* newMap = sMapMgr->CreateBaseMap(newMapId);
-    GetMap()->RemoveFromMap<MotionTransport>(this, false);
-    newMap->LoadGrid(x, y); // xinef: load before adding passengers to new map
-    SetMap(newMap);
-
     Relocate(x, y, z, o);
     GetMap()->AddToMap<MotionTransport>(this);
-
-    LoadStaticPassengers();
 }
 
 void MotionTransport::UpdatePassengerPositions(PassengerSet& passengers)
@@ -631,7 +642,7 @@ void MotionTransport::UpdatePassengerPositions(PassengerSet& passengers)
             case TYPEID_UNIT:
                 {
                     Creature* creature = passenger->ToCreature();
-                    GetMap()->CreatureRelocation(creature, x, y, z, o);
+                    GetMap()->CreatureRelocation(creature, x, y, z, o, false);
 
                     creature->GetTransportHomePosition(x, y, z, o);
                     CalculatePassengerPosition(x, y, z, &o);
@@ -643,7 +654,7 @@ void MotionTransport::UpdatePassengerPositions(PassengerSet& passengers)
                     GetMap()->PlayerRelocation(passenger->ToPlayer(), x, y, z, o);
                 break;
             case TYPEID_GAMEOBJECT:
-                GetMap()->GameObjectRelocation(passenger->ToGameObject(), x, y, z, o);
+                GetMap()->GameObjectRelocation(passenger->ToGameObject(), x, y, z, o, false);
                 break;
             case TYPEID_DYNAMICOBJECT:
                 GetMap()->DynamicObjectRelocation(passenger->ToDynObject(), x, y, z, o);
@@ -780,7 +791,6 @@ bool StaticTransport::Create(ObjectGuid::LowType guidlow, uint32 name_id, Map* m
     LastUsedScriptID = GetGOInfo()->ScriptId;
     AIM_Initialize();
 
-    this->setActive(true);
     return true;
 }
 
@@ -915,7 +925,8 @@ void StaticTransport::UpdatePosition(float x, float y, float z, float o)
     if (!GetMap()->IsGridLoaded(x, y)) // pussywizard: should not happen, but just in case
         GetMap()->LoadGrid(x, y);
 
-    GetMap()->GameObjectRelocation(this, x, y, z, o); // this also relocates the model
+    Relocate(x, y, z, o);
+    UpdateModelPosition();
     UpdatePassengerPositions();
 }
 
@@ -942,17 +953,14 @@ void StaticTransport::UpdatePassengerPositions()
         switch (passenger->GetTypeId())
         {
             case TYPEID_UNIT:
-                GetMap()->CreatureRelocation(passenger->ToCreature(), x, y, z, o);
+                GetMap()->CreatureRelocation(passenger->ToCreature(), x, y, z, o, false);
                 break;
             case TYPEID_PLAYER:
                 if (passenger->IsInWorld())
-                {
                     GetMap()->PlayerRelocation(passenger->ToPlayer(), x, y, z, o);
-                    passenger->ToPlayer()->SetFallInformation(GameTime::GetGameTime().count(), z);
-                }
                 break;
             case TYPEID_GAMEOBJECT:
-                GetMap()->GameObjectRelocation(passenger->ToGameObject(), x, y, z, o);
+                GetMap()->GameObjectRelocation(passenger->ToGameObject(), x, y, z, o, false);
                 break;
             case TYPEID_DYNAMICOBJECT:
                 GetMap()->DynamicObjectRelocation(passenger->ToDynObject(), x, y, z, o);
@@ -1001,8 +1009,7 @@ void StaticTransport::RemovePassenger(WorldObject* passenger, bool withAll)
         {
             passenger->SetTransport(nullptr);
             passenger->m_movementInfo.flags &= ~MOVEMENTFLAG_ONTRANSPORT;
-            passenger->m_movementInfo.transport.guid.Clear();
-            passenger->m_movementInfo.transport.pos.Relocate(0.0f, 0.0f, 0.0f, 0.0f);
+            passenger->m_movementInfo.transport.Reset();
         }
     }
 }
diff --git a/src/server/game/Entities/Transport/Transport.h b/src/server/game/Entities/Transport/Transport.h
index 75fc9f9ee6b507..cc038e7225aca4 100644
--- a/src/server/game/Entities/Transport/Transport.h
+++ b/src/server/game/Entities/Transport/Transport.h
@@ -68,8 +68,6 @@ class MotionTransport : public Transport
     PassengerSet const& GetStaticPassengers() const { return _staticPassengers; }
     void UnloadStaticPassengers();
     void UnloadNonStaticPassengers();
-    void SetPassengersLoaded(bool loaded) { _passengersLoaded = loaded; }
-    bool PassengersLoaded() const { return _passengersLoaded; }
 
     KeyFrameVec const& GetKeyFrames() const { return _transportInfo->keyFrames; }
     void EnableMovement(bool enabled);
@@ -104,7 +102,6 @@ class MotionTransport : public Transport
 
     PassengerSet _staticPassengers;
     mutable std::mutex Lock;
-    bool _passengersLoaded;
     bool _delayedTeleport;
 };
 
diff --git a/src/server/game/Entities/Unit/Unit.cpp b/src/server/game/Entities/Unit/Unit.cpp
index b308603bc47c9f..be8dc194150115 100644
--- a/src/server/game/Entities/Unit/Unit.cpp
+++ b/src/server/game/Entities/Unit/Unit.cpp
@@ -32,7 +32,6 @@
 #include "CreatureAIImpl.h"
 #include "CreatureGroups.h"
 #include "DisableMgr.h"
-#include "DynamicVisibility.h"
 #include "Formulas.h"
 #include "GameObjectAI.h"
 #include "GameTime.h"
@@ -44,6 +43,7 @@
 #include "MoveSpline.h"
 #include "MoveSplineInit.h"
 #include "MovementGenerator.h"
+#include "MovementPacketBuilder.h"
 #include "ObjectAccessor.h"
 #include "ObjectMgr.h"
 #include "Opcodes.h"
@@ -567,11 +567,19 @@ void Unit::UpdateSplineMovement(uint32 t_diff)
     // this code cant be placed inside EscortMovementGenerator, because we cant delete active MoveGen while it is updated
     SplineHandler handler(this);
     movespline->updateState(t_diff, handler);
-    // Xinef: Spline was cleared by StopMoving, return
-    if (!movespline->Initialized())
+
+    if (movespline->isCyclic())
     {
-        DisableSpline();
-        return;
+        m_splineSyncTimer.Update(t_diff);
+        if (m_splineSyncTimer.Passed())
+        {
+            m_splineSyncTimer.Reset(5000); // Retail value, do not change
+
+            WorldPacket data(SMSG_FLIGHT_SPLINE_SYNC, 4 + GetPackGUID().size());
+            Movement::PacketBuilder::WriteSplineSync(*movespline, data);
+            data.appendPackGUID(GetGUID());
+            SendMessageToSet(&data, true);
+        }
     }
 
     bool arrived = movespline->Finalized();
@@ -584,17 +592,11 @@ void Unit::UpdateSplineMovement(uint32 t_diff)
             SetByteValue(UNIT_FIELD_BYTES_1, UNIT_BYTES_1_OFFSET_ANIM_TIER, movespline->GetAnimationType());
     }
 
-    // pussywizard: update always! not every 400ms, because movement generators need the actual position
-    //m_movesplineTimer.Update(t_diff);
-    //if (m_movesplineTimer.Passed() || arrived)
     UpdateSplinePosition();
 }
 
 void Unit::UpdateSplinePosition()
 {
-    //static uint32 const positionUpdateDelay = 400;
-
-    //m_movesplineTimer.Reset(positionUpdateDelay);
     Movement::Location loc = movespline->ComputePosition();
 
     if (movespline->onTransport)
@@ -607,16 +609,14 @@ void Unit::UpdateSplinePosition()
 
         if (TransportBase* transport = GetDirectTransport())
             transport->CalculatePassengerPosition(loc.x, loc.y, loc.z, &loc.orientation);
+        else
+            return;
     }
 
-    // Xinef: if we had spline running update orientation along with position
-    //if (HasUnitState(UNIT_STATE_CANNOT_TURN))
-    //    loc.orientation = GetOrientation();
+    if (HasUnitState(UNIT_STATE_CANNOT_TURN))
+        loc.orientation = GetOrientation();
 
-    if (GetTypeId() == TYPEID_PLAYER)
-        UpdatePosition(loc.x, loc.y, loc.z, loc.orientation);
-    else
-        ToCreature()->SetPosition(loc.x, loc.y, loc.z, loc.orientation);
+    UpdatePosition(loc.x, loc.y, loc.z, loc.orientation);
 }
 
 void Unit::DisableSpline()
@@ -15709,15 +15709,9 @@ void Unit::CleanupBeforeRemoveFromMap(bool finalCleanup)
 
 void Unit::CleanupsBeforeDelete(bool finalCleanup)
 {
-    if (GetTransport())
-    {
-        GetTransport()->RemovePassenger(this);
-        SetTransport(nullptr);
-        m_movementInfo.transport.Reset();
-        m_movementInfo.RemoveMovementFlag(MOVEMENTFLAG_ONTRANSPORT);
-    }
-
     CleanupBeforeRemoveFromMap(finalCleanup);
+
+    WorldObject::CleanupsBeforeDelete(finalCleanup);
 }
 
 void Unit::UpdateCharmAI()
@@ -20253,10 +20247,14 @@ bool Unit::UpdatePosition(float x, float y, float z, float orientation, bool tel
     if (!Acore::IsValidMapCoord(x, y, z, orientation))
         return false;
 
-    float old_orientation = GetOrientation();
-    float current_z = GetPositionZ();
-    bool turn = (old_orientation != orientation);
-    bool relocated = (teleport || GetPositionX() != x || GetPositionY() != y || current_z != z);
+    // Check if angular distance changed
+    bool const turn = G3D::fuzzyGt(M_PI - fabs(fabs(GetOrientation() - orientation) - M_PI), 0.0f);
+
+    // G3D::fuzzyEq won't help here, in some cases magnitudes differ by a little more than G3D::eps, but should be considered equal
+    bool const relocated = (teleport ||
+        std::fabs(GetPositionX() - x) > 0.001f ||
+        std::fabs(GetPositionY() - y) > 0.001f ||
+        std::fabs(GetPositionZ() - z) > 0.001f);
 
     if (!GetVehicle())
     {
@@ -20282,6 +20280,8 @@ bool Unit::UpdatePosition(float x, float y, float z, float orientation, bool tel
             UpdateObjectVisibility(false);
     }
 
+    UpdatePositionData();
+
     return (relocated || turn);
 }
 
diff --git a/src/server/game/Entities/Unit/Unit.h b/src/server/game/Entities/Unit/Unit.h
index 5fe385fb78858f..bdd2a0891bb7e8 100644
--- a/src/server/game/Entities/Unit/Unit.h
+++ b/src/server/game/Entities/Unit/Unit.h
@@ -2575,7 +2575,7 @@ class Unit : public WorldObject
     uint32 m_state;                                     // Even derived shouldn't modify
     uint32 m_CombatTimer;
     uint32 m_lastManaUse;                               // msecs
-    //TimeTrackerSmall m_movesplineTimer;
+    TimeTrackerSmall m_splineSyncTimer;
 
     Diminishing m_Diminishing;
     // Manage all Units that are threatened by us
diff --git a/src/server/game/Entities/Vehicle/Vehicle.cpp b/src/server/game/Entities/Vehicle/Vehicle.cpp
index b33502da2d9957..de264e947cbeb7 100644
--- a/src/server/game/Entities/Vehicle/Vehicle.cpp
+++ b/src/server/game/Entities/Vehicle/Vehicle.cpp
@@ -545,7 +545,8 @@ bool Vehicle::IsVehicleInUse()
 
 void Vehicle::TeleportVehicle(float x, float y, float z, float ang)
 {
-    _me->GetMap()->LoadGrid(x, y);
+    if (!_me->GetMap()->IsGridLoaded(x, y))
+        _me->GetMap()->LoadGrid(x, y);
     _me->NearTeleportTo(x, y, z, ang, true);
 
     for (SeatMap::const_iterator itr = Seats.begin(); itr != Seats.end(); ++itr)
diff --git a/src/server/game/Grids/NGrid.cpp b/src/server/game/Grids/NGrid.cpp
index c20bf555824898..337d7dded85a3d 100644
--- a/src/server/game/Grids/NGrid.cpp
+++ b/src/server/game/Grids/NGrid.cpp
@@ -23,7 +23,7 @@ i_unloadActiveLockCount(0), i_unloadExplicitLock(false), i_unloadReferenceLock(f
 {
 }
 
-GridInfo::GridInfo(std::chrono::seconds expiry, bool unload /*= true */) : i_timer(expiry.count()), vis_Update(0, irand(0, DEFAULT_VISIBILITY_NOTIFY_PERIOD)),
+GridInfo::GridInfo(time_t expiry, bool unload /*= true */) : i_timer(expiry), vis_Update(0, irand(0, DEFAULT_VISIBILITY_NOTIFY_PERIOD)),
 i_unloadActiveLockCount(0), i_unloadExplicitLock(!unload), i_unloadReferenceLock(false)
 {
 }
diff --git a/src/server/game/Grids/NGrid.h b/src/server/game/Grids/NGrid.h
index a49a299194cd99..9a8f64fdbccc4e 100644
--- a/src/server/game/Grids/NGrid.h
+++ b/src/server/game/Grids/NGrid.h
@@ -32,7 +32,7 @@ class AC_GAME_API GridInfo
 {
 public:
     GridInfo();
-    GridInfo(std::chrono::seconds expiry, bool unload = true);
+    GridInfo(time_t expiry, bool unload = true);
     TimeTracker const& getTimeTracker() const { return i_timer; }
     bool getUnloadLock() const { return i_unloadActiveLockCount || i_unloadExplicitLock || i_unloadReferenceLock; }
     void setUnloadExplicitLock(bool on) { i_unloadExplicitLock = on; }
@@ -73,7 +73,7 @@ class NGrid
 {
 public:
     typedef Grid<ACTIVE_OBJECT, WORLD_OBJECT_TYPES, GRID_OBJECT_TYPES> GridType;
-    NGrid(uint32 id, int32 x, int32 y, std::chrono::seconds expiry, bool unload = true) :
+    NGrid(uint32 id, int32 x, int32 y, time_t expiry, bool unload = true) :
         i_gridId(id), i_GridInfo(GridInfo(expiry, unload)), i_x(x), i_y(y),
         i_cellstate(GRID_STATE_INVALID), i_GridObjectDataLoaded(false)
     { }
@@ -111,8 +111,8 @@ class NGrid
     void setUnloadReferenceLock(bool on) { i_GridInfo.setUnloadReferenceLock(on); }
     void incUnloadActiveLock() { i_GridInfo.incUnloadActiveLock(); }
     void decUnloadActiveLock() { i_GridInfo.decUnloadActiveLock(); }
-    void ResetTimeTracker(std::chrono::seconds interval) { i_GridInfo.ResetTimeTracker(interval.count()); }
-    void UpdateTimeTracker(std::chrono::seconds diff) { i_GridInfo.UpdateTimeTracker(diff.count()); }
+    void ResetTimeTracker(time_t interval) { i_GridInfo.ResetTimeTracker(interval); }
+    void UpdateTimeTracker(time_t diff) { i_GridInfo.UpdateTimeTracker(diff); }
 
     /*
     template<class SPECIFIC_OBJECT> void AddWorldObject(const uint32 x, const uint32 y, SPECIFIC_OBJECT *obj)
diff --git a/src/server/game/Grids/Notifiers/GridNotifiers.cpp b/src/server/game/Grids/Notifiers/GridNotifiers.cpp
index c9e9bd73522f3c..9b8ae064f34183 100644
--- a/src/server/game/Grids/Notifiers/GridNotifiers.cpp
+++ b/src/server/game/Grids/Notifiers/GridNotifiers.cpp
@@ -86,7 +86,7 @@ void VisibleNotifier::SendToSelf()
     i_data.BuildPacket(&packet);
     i_player.GetSession()->SendPacket(&packet);
 
-    for (std::vector<Unit*>::const_iterator it = i_visibleNow.begin(); it != i_visibleNow.end(); ++it)
+    for (std::set<Unit*>::const_iterator it = i_visibleNow.begin(); it != i_visibleNow.end(); ++it)
     {
         i_player.GetInitialVisiblePackets(*it);
     }
diff --git a/src/server/game/Grids/Notifiers/GridNotifiers.h b/src/server/game/Grids/Notifiers/GridNotifiers.h
index c634fe9e35f3f6..86fbfe44df560a 100644
--- a/src/server/game/Grids/Notifiers/GridNotifiers.h
+++ b/src/server/game/Grids/Notifiers/GridNotifiers.h
@@ -42,16 +42,10 @@ namespace Acore
     {
         Player& i_player;
         GuidUnorderedSet vis_guids;
-        std::vector<Unit*>& i_visibleNow;
-        bool i_gobjOnly;
+        std::set<Unit*> i_visibleNow;
         UpdateData i_data;
 
-        VisibleNotifier(Player& player, bool gobjOnly) :
-            i_player(player), vis_guids(player.m_clientGUIDs), i_visibleNow(player.m_newVisible), i_gobjOnly(gobjOnly)
-        {
-            i_visibleNow.clear();
-        }
-
+        VisibleNotifier(Player& player) : i_player(player), vis_guids(player.m_clientGUIDs) {}
         template<class T> void Visit(GridRefMgr<T>& m);
         void SendToSelf(void);
     };
@@ -69,7 +63,7 @@ namespace Acore
 
     struct PlayerRelocationNotifier : public VisibleNotifier
     {
-        PlayerRelocationNotifier(Player& player) : VisibleNotifier(player, false) { }
+        PlayerRelocationNotifier(Player& player) : VisibleNotifier(player) { }
 
         template<class T> void Visit(GridRefMgr<T>& m) { VisibleNotifier::Visit(m); }
         void Visit(CreatureMapType&);
diff --git a/src/server/game/Grids/Notifiers/GridNotifiersImpl.h b/src/server/game/Grids/Notifiers/GridNotifiersImpl.h
index 00d967880c94e0..8741828eaa29d6 100644
--- a/src/server/game/Grids/Notifiers/GridNotifiersImpl.h
+++ b/src/server/game/Grids/Notifiers/GridNotifiersImpl.h
@@ -32,10 +32,6 @@
 template<class T>
 inline void Acore::VisibleNotifier::Visit(GridRefMgr<T>& m)
 {
-    // Xinef: Update gameobjects only
-    if (i_gobjOnly)
-        return;
-
     for (typename GridRefMgr<T>::iterator iter = m.begin(); iter != m.end(); ++iter)
     {
         vis_guids.erase(iter->GetSource()->GetGUID());
diff --git a/src/server/game/Grids/ObjectGridLoader.cpp b/src/server/game/Grids/ObjectGridLoader.cpp
index c0d9e78c08e91d..09e66bc96b1218 100644
--- a/src/server/game/Grids/ObjectGridLoader.cpp
+++ b/src/server/game/Grids/ObjectGridLoader.cpp
@@ -25,6 +25,7 @@
 #include "ObjectMgr.h"
 #include "Transport.h"
 #include "Vehicle.h"
+#include "GameTime.h"
 
 void ObjectGridEvacuator::Visit(CreatureMapType& m)
 {
@@ -113,18 +114,6 @@ void AddObjectHelper(CellCoord& cell, CreatureMapType& m, uint32& count, Map* ma
     ++count;
 }
 
-template <>
-void AddObjectHelper(CellCoord& cell, GameObjectMapType& m, uint32& count, Map* map, GameObject* obj)
-{
-    obj->AddToGrid(m);
-    ObjectGridLoader::SetObjectCell(obj, cell);
-    obj->AddToWorld();
-    if (obj->isActiveObject())
-        map->AddToActive(obj);
-
-    ++count;
-}
-
 template <class T>
 void LoadHelper(CellGuidSet const& /*guid_set*/, CellCoord& /*cell*/, GridRefMgr<T>& /*m*/, uint32& /*count*/, Map* /*map*/)
 {
@@ -135,8 +124,13 @@ void LoadHelper(CellGuidSet const& guid_set, CellCoord& cell, GridRefMgr<Creatur
 {
     for (CellGuidSet::const_iterator i_guid = guid_set.begin(); i_guid != guid_set.end(); ++i_guid)
     {
-        Creature* obj = new Creature();
+        // Don't spawn at all if there's a respawn timer
         ObjectGuid::LowType guid = *i_guid;
+        time_t now = GameTime::GetGameTime().count();
+        if (map->GetCreatureRespawnTime(guid) > now)
+            continue;
+
+        Creature* obj = new Creature();
         if (!obj->LoadFromDB(guid, map))
         {
             delete obj;
@@ -162,7 +156,12 @@ void LoadHelper(CellGuidSet const& guid_set, CellCoord& cell, GridRefMgr<GameObj
 {
     for (CellGuidSet::const_iterator i_guid = guid_set.begin(); i_guid != guid_set.end(); ++i_guid)
     {
+        // Don't spawn at all if there's a respawn timer
         ObjectGuid::LowType guid = *i_guid;
+        time_t now = GameTime::GetGameTime().count();
+        if (map->GetGORespawnTime(guid) > now)
+            continue;
+
         GameObjectData const* data = sObjectMgr->GetGameObjectData(guid);
         GameObject* obj = data && sObjectMgr->IsGameObjectStaticTransport(data->id) ? new StaticTransport() : new GameObject();
 
diff --git a/src/server/game/Handlers/MovementHandler.cpp b/src/server/game/Handlers/MovementHandler.cpp
index f0889150b41b17..551fea862313c8 100644
--- a/src/server/game/Handlers/MovementHandler.cpp
+++ b/src/server/game/Handlers/MovementHandler.cpp
@@ -49,19 +49,20 @@ void WorldSession::HandleMoveWorldportAckOpcode(WorldPacket& /*recvData*/)
 
 void WorldSession::HandleMoveWorldportAck()
 {
+    Player* player = GetPlayer();
     // ignore unexpected far teleports
-    if (!GetPlayer()->IsBeingTeleportedFar())
+    if (!player->IsBeingTeleportedFar())
         return;
 
-    GetPlayer()->SetSemaphoreTeleportFar(0);
+    player->SetSemaphoreTeleportFar(0);
 
     // get the teleport destination
-    WorldLocation const& loc = GetPlayer()->GetTeleportDest();
+    WorldLocation const& loc = player->GetTeleportDest();
 
     // possible errors in the coordinate validity check
     if (!MapMgr::IsValidMapCoord(loc))
     {
-        KickPlayer("!MapMgr::IsValidMapCoord(loc)");
+        LogoutPlayer(false);
         return;
     }
 
@@ -69,198 +70,202 @@ void WorldSession::HandleMoveWorldportAck()
     MapEntry const* mEntry = sMapStore.LookupEntry(loc.GetMapId());
     InstanceTemplate const* mInstance = sObjectMgr->GetInstanceTemplate(loc.GetMapId());
 
-    Map* oldMap = GetPlayer()->GetMap();
-    if (GetPlayer()->IsInWorld())
+    Map* oldMap = player->GetMap();
+    if (player->IsInWorld())
     {
-        LOG_ERROR("network.opcode", "Player (Name {}) is still in world when teleported from map {} to new map {}", GetPlayer()->GetName(), oldMap->GetId(), loc.GetMapId());
-        oldMap->RemovePlayerFromMap(GetPlayer(), false);
+        LOG_ERROR("network.opcode", "Player (Name {}) is still in world when teleported from map {} to new map {}", player->GetName(), oldMap->GetId(), loc.GetMapId());
+        oldMap->RemovePlayerFromMap(player, false);
     }
 
     // reset instance validity, except if going to an instance inside an instance
-    if (!GetPlayer()->m_InstanceValid && !mInstance)
+    if (!player->m_InstanceValid && !mInstance)
     {
-        GetPlayer()->m_InstanceValid = true;
+        player->m_InstanceValid = true;
         // pussywizard: m_InstanceValid can be false only by leaving a group in an instance => so remove temp binds that could not be removed because player was still on the map!
-        if (!sInstanceSaveMgr->PlayerIsPermBoundToInstance(GetPlayer()->GetGUID(), oldMap->GetId(), oldMap->GetDifficulty()))
-            sInstanceSaveMgr->PlayerUnbindInstance(GetPlayer()->GetGUID(), oldMap->GetId(), oldMap->GetDifficulty(), true);
+        if (!sInstanceSaveMgr->PlayerIsPermBoundToInstance(player->GetGUID(), oldMap->GetId(), oldMap->GetDifficulty()))
+            sInstanceSaveMgr->PlayerUnbindInstance(player->GetGUID(), oldMap->GetId(), oldMap->GetDifficulty(), true);
     }
 
     // relocate the player to the teleport destination
-    Map* newMap = sMapMgr->CreateMap(loc.GetMapId(), GetPlayer());
+    Map* newMap = sMapMgr->CreateMap(loc.GetMapId(), player);
     // the CanEnter checks are done in TeleporTo but conditions may change
     // while the player is in transit, for example the map may get full
-    if (!newMap || newMap->CannotEnter(GetPlayer(), false))
+    if (!newMap || newMap->CannotEnter(player, false))
     {
-        LOG_ERROR("network.opcode", "Map {} could not be created for player {}, porting player to homebind", loc.GetMapId(), GetPlayer()->GetGUID().ToString());
-        GetPlayer()->TeleportTo(GetPlayer()->m_homebindMapId, GetPlayer()->m_homebindX, GetPlayer()->m_homebindY, GetPlayer()->m_homebindZ, GetPlayer()->m_homebindO);
+        LOG_ERROR("network.opcode", "Map {} could not be created for player {}, porting player to homebind", loc.GetMapId(), player->GetGUID().ToString());
+        player->TeleportTo(player->m_homebindMapId, player->m_homebindX, player->m_homebindY, player->m_homebindZ, player->m_homebindO);
         return;
     }
 
-    float z = loc.GetPositionZ() + GetPlayer()->GetHoverHeight();
-    GetPlayer()->Relocate(loc.GetPositionX(), loc.GetPositionY(), z, loc.GetOrientation());
+    float z = loc.GetPositionZ() + player->GetHoverHeight();
+    player->Relocate(loc.GetPositionX(), loc.GetPositionY(), z, loc.GetOrientation());
 
-    GetPlayer()->ResetMap();
-    GetPlayer()->SetMap(newMap);
+    player->ResetMap();
+    player->SetMap(newMap);
 
-    GetPlayer()->UpdatePositionData();
+    player->UpdatePositionData();
 
-    GetPlayer()->SendInitialPacketsBeforeAddToMap();
-    if (!GetPlayer()->GetMap()->AddPlayerToMap(GetPlayer()))
+    player->SendInitialPacketsBeforeAddToMap();
+    if (!player->GetMap()->AddPlayerToMap(player))
     {
         LOG_ERROR("network.opcode", "WORLD: failed to teleport player {} ({}) to map {} because of unknown reason!",
-            GetPlayer()->GetName(), GetPlayer()->GetGUID().ToString(), loc.GetMapId());
-        GetPlayer()->ResetMap();
-        GetPlayer()->SetMap(oldMap);
-        GetPlayer()->TeleportTo(GetPlayer()->m_homebindMapId, GetPlayer()->m_homebindX, GetPlayer()->m_homebindY, GetPlayer()->m_homebindZ, GetPlayer()->m_homebindO);
+            player->GetName(), player->GetGUID().ToString(), loc.GetMapId());
+        player->ResetMap();
+        player->SetMap(oldMap);
+        player->TeleportTo(player->m_homebindMapId, player->m_homebindX, player->m_homebindY, player->m_homebindZ, player->m_homebindO);
         return;
     }
 
     oldMap->AfterPlayerUnlinkFromMap();
 
     // pussywizard: transport teleport couldn't teleport us to the same map (some other teleport pending, reqs not met, etc.), but we still have transport set until player moves! clear it if map differs (crashfix)
-    if (Transport* t = _player->GetTransport())
-        if (!t->IsInMap(_player))
+    if (Transport* t = player->GetTransport())
+        if (!t->IsInMap(player))
         {
-            t->RemovePassenger(_player);
-            _player->m_transport = nullptr;
-            _player->m_movementInfo.transport.Reset();
-            _player->m_movementInfo.RemoveMovementFlag(MOVEMENTFLAG_ONTRANSPORT);
+            t->RemovePassenger(player);
+            player->m_transport = nullptr;
+            player->m_movementInfo.transport.Reset();
+            player->m_movementInfo.RemoveMovementFlag(MOVEMENTFLAG_ONTRANSPORT);
         }
 
-    if (!_player->getHostileRefMgr().IsEmpty())
-        _player->getHostileRefMgr().deleteReferences(true); // pussywizard: multithreading crashfix
+    if (!player->getHostileRefMgr().IsEmpty())
+        player->getHostileRefMgr().deleteReferences(true); // pussywizard: multithreading crashfix
 
-    CellCoord pair(Acore::ComputeCellCoord(GetPlayer()->GetPositionX(), GetPlayer()->GetPositionY()));
+    CellCoord pair(Acore::ComputeCellCoord(player->GetPositionX(), player->GetPositionY()));
     Cell cell(pair);
     if (!GridCoord(cell.GridX(), cell.GridY()).IsCoordValid())
     {
-        KickPlayer("!GridCoord(cell.GridX(), cell.GridY()).IsCoordValid()");
+        LogoutPlayer(false);
         return;
     }
-    newMap->LoadGrid(GetPlayer()->GetPositionX(), GetPlayer()->GetPositionY());
+
+    if (!newMap->IsGridLoaded(player->GetPositionX(), player->GetPositionY()))
+        newMap->LoadGrid(player->GetPositionX(), player->GetPositionY());
 
     // pussywizard: player supposed to enter bg map
-    if (_player->InBattleground())
+    if (player->InBattleground())
     {
         // but landed on another map, cleanup data
         if (!mEntry->IsBattlegroundOrArena())
-            _player->SetBattlegroundId(0, BATTLEGROUND_TYPE_NONE, PLAYER_MAX_BATTLEGROUND_QUEUES, false, false, TEAM_NEUTRAL);
+            player->SetBattlegroundId(0, BATTLEGROUND_TYPE_NONE, PLAYER_MAX_BATTLEGROUND_QUEUES, false, false, TEAM_NEUTRAL);
         // everything ok
-        else if (Battleground* bg = _player->GetBattleground())
+        else if (Battleground* bg = player->GetBattleground())
         {
-            if (_player->IsInvitedForBattlegroundInstance()) // GMs are not invited, so they are not added to participants
-                bg->AddPlayer(_player);
+            if (player->IsInvitedForBattlegroundInstance()) // GMs are not invited, so they are not added to participants
+                bg->AddPlayer(player);
         }
     }
 
     // pussywizard: arena spectator stuff
     {
-        if (newMap->IsBattleArena() && ((BattlegroundMap*)newMap)->GetBG() && _player->HasPendingSpectatorForBG(((BattlegroundMap*)newMap)->GetInstanceId()))
+        if (newMap->IsBattleArena() && ((BattlegroundMap*)newMap)->GetBG() && player->HasPendingSpectatorForBG(((BattlegroundMap*)newMap)->GetInstanceId()))
         {
-            _player->ClearReceivedSpectatorResetFor();
-            _player->SetIsSpectator(true);
-            ArenaSpectator::SendCommand(_player, "%sENABLE", SPECTATOR_ADDON_PREFIX);
-            ((BattlegroundMap*)newMap)->GetBG()->AddSpectator(_player);
-            ArenaSpectator::HandleResetCommand(_player);
+            player->ClearReceivedSpectatorResetFor();
+            player->SetIsSpectator(true);
+            ArenaSpectator::SendCommand(player, "%sENABLE", SPECTATOR_ADDON_PREFIX);
+            ((BattlegroundMap*)newMap)->GetBG()->AddSpectator(player);
+            ArenaSpectator::HandleResetCommand(player);
         }
         else
-            _player->SetIsSpectator(false);
+            player->SetIsSpectator(false);
 
-        GetPlayer()->SetPendingSpectatorForBG(0);
+        player->SetPendingSpectatorForBG(0);
 
-        if (uint32 inviteInstanceId = _player->GetPendingSpectatorInviteInstanceId())
+        if (uint32 inviteInstanceId = player->GetPendingSpectatorInviteInstanceId())
         {
             if (Battleground* tbg = sBattlegroundMgr->GetBattleground(inviteInstanceId, BATTLEGROUND_TYPE_NONE))
-                tbg->RemoveToBeTeleported(_player->GetGUID());
-            _player->SetPendingSpectatorInviteInstanceId(0);
+                tbg->RemoveToBeTeleported(player->GetGUID());
+            player->SetPendingSpectatorInviteInstanceId(0);
         }
     }
 
-    // xinef: do this again, player can be teleported inside bg->AddPlayer(_player)!!!!
-    CellCoord pair2(Acore::ComputeCellCoord(GetPlayer()->GetPositionX(), GetPlayer()->GetPositionY()));
+    // xinef: do this again, player can be teleported inside bg->AddPlayer(player)!!!!
+    CellCoord pair2(Acore::ComputeCellCoord(player->GetPositionX(), player->GetPositionY()));
     Cell cell2(pair2);
     if (!GridCoord(cell2.GridX(), cell2.GridY()).IsCoordValid())
     {
         KickPlayer("!GridCoord(cell2.GridX(), cell2.GridY()).IsCoordValid()");
         return;
     }
-    newMap->LoadGrid(GetPlayer()->GetPositionX(), GetPlayer()->GetPositionY());
 
-    GetPlayer()->SendInitialPacketsAfterAddToMap();
+    if (!newMap->IsGridLoaded(player->GetPositionX(), player->GetPositionY()))
+        newMap->LoadGrid(player->GetPositionX(), player->GetPositionY());
+
+    player->SendInitialPacketsAfterAddToMap();
 
     // flight fast teleport case
-    if (GetPlayer()->IsInFlight())
+    if (player->IsInFlight())
     {
-        if (!GetPlayer()->InBattleground())
+        if (!player->InBattleground())
         {
             // short preparations to continue flight
-            MovementGenerator* movementGenerator = GetPlayer()->GetMotionMaster()->top();
-            movementGenerator->Initialize(GetPlayer());
+            MovementGenerator* movementGenerator = player->GetMotionMaster()->top();
+            movementGenerator->Initialize(player);
             return;
         }
 
         // battleground state prepare, stop flight
-        GetPlayer()->GetMotionMaster()->MovementExpired();
-        GetPlayer()->CleanupAfterTaxiFlight();
+        player->GetMotionMaster()->MovementExpired();
+        player->CleanupAfterTaxiFlight();
     }
 
     // resurrect character at enter into instance where his corpse exist after add to map
-    Corpse* corpse = GetPlayer()->GetMap()->GetCorpseByPlayer(GetPlayer()->GetGUID());
+    Corpse* corpse = player->GetMap()->GetCorpseByPlayer(player->GetGUID());
     if (corpse && corpse->GetType() != CORPSE_BONES)
     {
         if (mEntry->IsDungeon())
         {
-            GetPlayer()->ResurrectPlayer(0.5f);
-            GetPlayer()->SpawnCorpseBones();
+            player->ResurrectPlayer(0.5f);
+            player->SpawnCorpseBones();
         }
     }
 
     if (!corpse && mEntry->IsDungeon())
     {
         // resurrect character upon entering instance when the corpse is not available anymore
-        if (GetPlayer()->GetCorpseLocation().GetMapId() == mEntry->MapID)
+        if (player->GetCorpseLocation().GetMapId() == mEntry->MapID)
         {
-            GetPlayer()->ResurrectPlayer(0.5f);
-            GetPlayer()->RemoveCorpse();
+            player->ResurrectPlayer(0.5f);
+            player->RemoveCorpse();
         }
     }
 
     bool allowMount = !mEntry->IsDungeon() || mEntry->IsBattlegroundOrArena();
     if (mInstance)
     {
-        Difficulty diff = GetPlayer()->GetDifficulty(mEntry->IsRaid());
+        Difficulty diff = player->GetDifficulty(mEntry->IsRaid());
         if (MapDifficulty const* mapDiff = GetMapDifficultyData(mEntry->MapID, diff))
             if (mapDiff->resetTime)
                 if (time_t timeReset = sInstanceSaveMgr->GetResetTimeFor(mEntry->MapID, diff))
                 {
                     uint32 timeleft = uint32(timeReset - GameTime::GetGameTime().count());
-                    GetPlayer()->SendInstanceResetWarning(mEntry->MapID, diff, timeleft, true);
+                    player->SendInstanceResetWarning(mEntry->MapID, diff, timeleft, true);
                 }
         allowMount = mInstance->AllowMount;
     }
 
     // mount allow check
     if (!allowMount)
-        _player->RemoveAurasByType(SPELL_AURA_MOUNTED);
+        player->RemoveAurasByType(SPELL_AURA_MOUNTED);
 
     // update zone immediately, otherwise leave channel will cause crash in mtmap
     uint32 newzone, newarea;
-    GetPlayer()->GetZoneAndAreaId(newzone, newarea);
-    GetPlayer()->UpdateZone(newzone, newarea);
+    player->GetZoneAndAreaId(newzone, newarea);
+    player->UpdateZone(newzone, newarea);
 
     // honorless target
-    if (GetPlayer()->pvpInfo.IsHostile)
-        GetPlayer()->CastSpell(GetPlayer(), 2479, true);
+    if (player->pvpInfo.IsHostile)
+        player->CastSpell(player, 2479, true);
 
     // in friendly area
-    else if (GetPlayer()->IsPvP() && !GetPlayer()->HasPlayerFlag(PLAYER_FLAGS_IN_PVP))
-        GetPlayer()->UpdatePvP(false, false);
+    else if (player->IsPvP() && !player->HasPlayerFlag(PLAYER_FLAGS_IN_PVP))
+        player->UpdatePvP(false, false);
 
     // resummon pet
-    GetPlayer()->ResummonPetTemporaryUnSummonedIfAny();
+    player->ResummonPetTemporaryUnSummonedIfAny();
 
     //lets process all delayed operations on successful teleport
-    GetPlayer()->ProcessDelayedOperations();
+    player->ProcessDelayedOperations();
 }
 
 void WorldSession::HandleMoveTeleportAck(WorldPacket& recvData)
diff --git a/src/server/game/Maps/Map.cpp b/src/server/game/Maps/Map.cpp
index e66ef5c9b988d3..643c884d118f60 100644
--- a/src/server/game/Maps/Map.cpp
+++ b/src/server/game/Maps/Map.cpp
@@ -69,6 +69,11 @@ Map::~Map()
 
     sScriptMgr->OnDestroyMap(this);
 
+    // Delete all waiting spawns, else there will be a memory leak
+    // This doesn't delete from database.
+    _creatureRespawnTimes.clear();
+    _goRespawnTimes.clear();
+
     while (!i_worldObjects.empty())
     {
         WorldObject* obj = *i_worldObjects.begin();
@@ -237,7 +242,7 @@ void Map::LoadMapAndVMap(int gx, int gy)
     }
 }
 
-Map::Map(uint32 id, std::chrono::seconds expiry, uint32 InstanceId, uint8 SpawnMode, Map* _parent) :
+Map::Map(uint32 id, time_t expiry, uint32 InstanceId, uint8 SpawnMode, Map* _parent) :
     _creatureToMoveLock(false), _gameObjectsToMoveLock(false), _dynamicObjectsToMoveLock(false),
     i_mapEntry(sMapStore.LookupEntry(id)), i_spawnMode(SpawnMode), i_InstanceId(InstanceId),
     m_unloadTimer(0), m_VisibleDistance(DEFAULT_VISIBILITY_DISTANCE), _instanceResetPeriod(0),
@@ -440,6 +445,9 @@ void Map::DeleteFromWorld(Player* player)
 
 void Map::EnsureGridCreated(const GridCoord& p)
 {
+    if (getNGrid(p.x_coord, p.y_coord))
+        return;
+
     std::lock_guard<std::mutex> guard(GridLock);
     EnsureGridCreated_i(p);
 }
@@ -493,13 +501,13 @@ bool Map::EnsureGridLoaded(const Cell& cell)
     NGridType* grid = getNGrid(cell.GridX(), cell.GridY());
 
     ASSERT(grid);
-    if (!isGridObjectDataLoaded(cell.GridX(), cell.GridY()))
+    if (!grid->isGridObjectDataLoaded())
     {
         //if (!isGridObjectDataLoaded(cell.GridX(), cell.GridY()))
         //{
         LOG_DEBUG("maps", "Loading grid[{}, {}] for map {} instance {}", cell.GridX(), cell.GridY(), GetId(), i_InstanceId);
 
-        setGridObjectDataLoaded(true, cell.GridX(), cell.GridY());
+        grid->setGridObjectDataLoaded(true);
 
         ObjectGridLoader loader(*grid, this, cell);
         loader.LoadN();
@@ -685,15 +693,7 @@ bool Map::AddToMap(MotionTransport* obj, bool /*checkTransport*/)
         return false; //Should delete object
     }
 
-    Cell cell(cellCoord);
-    if (obj->isActiveObject())
-        EnsureGridLoaded(cell);
-
     obj->AddToWorld();
-
-    if (obj->isActiveObject())
-        AddToActive(obj);
-
     _transports.insert(obj);
 
     // Broadcast creation to players
@@ -717,7 +717,8 @@ bool Map::AddToMap(MotionTransport* obj, bool /*checkTransport*/)
 
 bool Map::IsGridLoaded(const GridCoord& p) const
 {
-    return (getNGrid(p.x_coord, p.y_coord) && isGridObjectDataLoaded(p.x_coord, p.y_coord));
+    NGridType* grid = getNGrid(p.x_coord, p.y_coord);
+    return grid && grid->isGridObjectDataLoaded();
 }
 
 void Map::VisitNearbyCellsOf(WorldObject* obj, TypeContainerVisitor<Acore::ObjectUpdater, GridTypeMapContainer>& gridVisitor,
@@ -746,7 +747,7 @@ void Map::VisitNearbyCellsOf(WorldObject* obj, TypeContainerVisitor<Acore::Objec
             markCell(cell_id);
             CellCoord pair(x, y);
             Cell cell(pair);
-            //cell.SetNoCreate(); // in mmaps this is missing
+            cell.SetNoCreate();
 
             Visit(cell, gridVisitor);
             Visit(cell, worldVisitor);
@@ -786,18 +787,6 @@ void Map::Update(const uint32 t_diff, const uint32 s_diff, bool  /*thread*/)
     std::vector<Creature*> updateList;
     updateList.reserve(10);
 
-    // non-player active objects, increasing iterator in the loop in case of object removal
-    for (m_activeNonPlayersIter = m_activeNonPlayers.begin(); m_activeNonPlayersIter != m_activeNonPlayers.end();)
-    {
-        WorldObject* obj = *m_activeNonPlayersIter;
-        ++m_activeNonPlayersIter;
-
-        if (!obj || !obj->IsInWorld())
-            continue;
-
-        VisitNearbyCellsOf(obj, grid_object_update, world_object_update);
-    }
-
     // the player iterator is stored in the map object
     // to make sure calls to Map::Remove don't invalidate it
     for (m_mapRefIter = m_mapRefMgr.begin(); m_mapRefIter != m_mapRefMgr.end(); ++m_mapRefIter)
@@ -836,6 +825,18 @@ void Map::Update(const uint32 t_diff, const uint32 s_diff, bool  /*thread*/)
         }
     }
 
+    // non-player active objects, increasing iterator in the loop in case of object removal
+    for (m_activeNonPlayersIter = m_activeNonPlayers.begin(); m_activeNonPlayersIter != m_activeNonPlayers.end();)
+    {
+        WorldObject* obj = *m_activeNonPlayersIter;
+        ++m_activeNonPlayersIter;
+
+        if (!obj || !obj->IsInWorld())
+            continue;
+
+        VisitNearbyCellsOf(obj, grid_object_update, world_object_update);
+    }
+
     for (_transportsUpdateIter = _transports.begin(); _transportsUpdateIter != _transports.end();) // pussywizard: transports updated after VisitNearbyCellsOf, grids around are loaded, everything ok
     {
         MotionTransport* transport = *_transportsUpdateIter;
@@ -1015,8 +1016,6 @@ template<>
 void Map::RemoveFromMap(MotionTransport* obj, bool remove)
 {
     obj->RemoveFromWorld();
-    if (obj->isActiveObject())
-        RemoveFromActive(obj);
 
     Map::PlayerList const& players = GetPlayers();
     if (!players.IsEmpty())
@@ -1060,6 +1059,10 @@ void Map::PlayerRelocation(Player* player, float x, float y, float z, float o)
     Cell old_cell(player->GetPositionX(), player->GetPositionY());
     Cell new_cell(x, y);
 
+    player->Relocate(x, y, z, o);
+    if (player->IsVehicle())
+        player->GetVehicleKit()->RelocatePassengers();
+
     if (old_cell.DiffGrid(new_cell) || old_cell.DiffCell(new_cell))
     {
         LOG_DEBUG("maps", "Player {} relocation grid[{}, {}]cell[{}, {}]->grid[{}, {}]cell[{}, {}]", player->GetName().c_str(), old_cell.GridX(), old_cell.GridY(), old_cell.CellX(), old_cell.CellY(), new_cell.GridX(), new_cell.GridY(), new_cell.CellX(), new_cell.CellY());
@@ -1072,64 +1075,63 @@ void Map::PlayerRelocation(Player* player, float x, float y, float z, float o)
         AddToGrid(player, new_cell);
     }
 
-    player->Relocate(x, y, z, o);
-    if (player->IsVehicle())
-        player->GetVehicleKit()->RelocatePassengers();
     player->UpdatePositionData();
     player->UpdateObjectVisibility(false);
 }
 
-void Map::CreatureRelocation(Creature* creature, float x, float y, float z, float o)
+void Map::CreatureRelocation(Creature* creature, float x, float y, float z, float o, bool respawnRelocationOnFail)
 {
     Cell old_cell = creature->GetCurrentCell();
     Cell new_cell(x, y);
 
+    if (!respawnRelocationOnFail && !getNGrid(new_cell.GridX(), new_cell.GridY()))
+        return;
+
+    // delay creature move for grid/cell to grid/cell moves
     if (old_cell.DiffGrid(new_cell) || old_cell.DiffCell(new_cell))
     {
-        if (old_cell.DiffGrid(new_cell))
-            EnsureGridLoaded(new_cell);
-
         #ifdef ACORE_DEBUG
             LOG_DEBUG("maps", "Creature {} added to moving list from grid[{}, {}]cell[{}, {}] to grid[{}, {}]cell[{}, {}].", creature->GetGUID().ToString().c_str(), old_cell.GridX(), old_cell.GridY(), old_cell.CellX(), old_cell.CellY(), new_cell.GridX(), new_cell.GridY(), new_cell.CellX(), new_cell.CellY());
         #endif
         AddCreatureToMoveList(creature, x, y, z, o);
+        // in diffcell/diffgrid case notifiers called at finishing move creature in Map::MoveAllCreaturesInMoveList
     }
     else
     {
+        creature->Relocate(x, y, z, o);
+        if (creature->IsVehicle())
+            creature->GetVehicleKit()->RelocatePassengers();
+        creature->UpdateObjectVisibility(false);
+        creature->UpdatePositionData();
         RemoveCreatureFromMoveList(creature);
     }
-
-    creature->Relocate(x, y, z, o);
-    if (creature->IsVehicle())
-        creature->GetVehicleKit()->RelocatePassengers();
-    creature->UpdatePositionData();
-    creature->UpdateObjectVisibility(false);
 }
 
-void Map::GameObjectRelocation(GameObject* go, float x, float y, float z, float o)
+void Map::GameObjectRelocation(GameObject* go, float x, float y, float z, float o, bool respawnRelocationOnFail)
 {
     Cell old_cell = go->GetCurrentCell();
     Cell new_cell(x, y);
 
+    if (!respawnRelocationOnFail && !getNGrid(new_cell.GridX(), new_cell.GridY()))
+        return;
+
+    // delay creature move for grid/cell to grid/cell moves
     if (old_cell.DiffGrid(new_cell) || old_cell.DiffCell(new_cell))
     {
-        if (old_cell.DiffGrid(new_cell))
-            EnsureGridLoaded(new_cell);
-
         #ifdef ACORE_DEBUG
             LOG_DEBUG("maps", "GameObject {} added to moving list from grid[{}, {}]cell[{}, {}] to grid[{}, {}]cell[{}, {}].", go->GetGUID().ToString().c_str(), old_cell.GridX(), old_cell.GridY(), old_cell.CellX(), old_cell.CellY(), new_cell.GridX(), new_cell.GridY(), new_cell.CellX(), new_cell.CellY());
         #endif
         AddGameObjectToMoveList(go, x, y, z, o);
+        // in diffcell/diffgrid case notifiers called at finishing move go in Map::MoveAllGameObjectsInMoveList
     }
     else
     {
+        go->Relocate(x, y, z, o);
+        go->UpdateModelPosition();
+        go->SetPositionDataUpdate();
+        go->UpdateObjectVisibility(false);
         RemoveGameObjectFromMoveList(go);
     }
-
-    go->Relocate(x, y, z, o);
-    go->UpdateModelPosition();
-    go->SetPositionDataUpdate();
-    go->UpdateObjectVisibility(false);
 }
 
 void Map::DynamicObjectRelocation(DynamicObject* dynObj, float x, float y, float z, float o)
@@ -1137,24 +1139,25 @@ void Map::DynamicObjectRelocation(DynamicObject* dynObj, float x, float y, float
     Cell old_cell = dynObj->GetCurrentCell();
     Cell new_cell(x, y);
 
+    if (!getNGrid(new_cell.GridX(), new_cell.GridY()))
+        return;
+
+    // delay creature move for grid/cell to grid/cell moves
     if (old_cell.DiffGrid(new_cell) || old_cell.DiffCell(new_cell))
     {
-        if (old_cell.DiffGrid(new_cell))
-            EnsureGridLoaded(new_cell);
-
         #ifdef ACORE_DEBUG
             LOG_DEBUG("maps", "GameObject {} added to moving list from grid[{}, {}]cell[{}, {}] to grid[{}, {}]cell[{}, {}].", dynObj->GetGUID().ToString().c_str(), old_cell.GridX(), old_cell.GridY(), old_cell.CellX(), old_cell.CellY(), new_cell.GridX(), new_cell.GridY(), new_cell.CellX(), new_cell.CellY());
         #endif
         AddDynamicObjectToMoveList(dynObj, x, y, z, o);
+        // in diffcell/diffgrid case notifiers called at finishing move dynObj in Map::MoveAllGameObjectsInMoveList
     }
     else
     {
+        dynObj->Relocate(x, y, z, o);
+        dynObj->SetPositionDataUpdate();
+        dynObj->UpdateObjectVisibility(false);
         RemoveDynamicObjectFromMoveList(dynObj);
     }
-
-    dynObj->Relocate(x, y, z, o);
-    dynObj->SetPositionDataUpdate();
-    dynObj->UpdateObjectVisibility(false);
 }
 
 void Map::AddCreatureToMoveList(Creature* c, float x, float y, float z, float ang)
@@ -3150,11 +3153,14 @@ void Map::RemoveAllObjectsInRemoveList()
                 RemoveFromMap((DynamicObject*)obj, true);
                 break;
             case TYPEID_GAMEOBJECT:
-                if (MotionTransport* transport = obj->ToGameObject()->ToMotionTransport())
+            {
+                GameObject* go = obj->ToGameObject();
+                if (MotionTransport* transport = go->ToMotionTransport())
                     RemoveFromMap(transport, true);
                 else
-                    RemoveFromMap(obj->ToGameObject(), true);
+                    RemoveFromMap(go, true);
                 break;
+            }
             case TYPEID_UNIT:
                 // in case triggered sequence some spell can continue casting after prev CleanupsBeforeDelete call
                 // make sure that like sources auras/etc removed before destructor start
@@ -3258,12 +3264,6 @@ void Map::AddToActive(DynamicObject* d)
     AddToActiveHelper(d);
 }
 
-template<>
-void Map::AddToActive(GameObject* d)
-{
-    AddToActiveHelper(d);
-}
-
 template<class T>
 void Map::RemoveFromActive(T* obj)
 {
@@ -3298,12 +3298,6 @@ void Map::RemoveFromActive(DynamicObject* obj)
     RemoveFromActiveHelper(obj);
 }
 
-template<>
-void Map::RemoveFromActive(GameObject* obj)
-{
-    RemoveFromActiveHelper(obj);
-}
-
 template bool Map::AddToMap(Corpse*, bool);
 template bool Map::AddToMap(Creature*, bool);
 template bool Map::AddToMap(GameObject*, bool);
@@ -3316,7 +3310,7 @@ template void Map::RemoveFromMap(DynamicObject*, bool);
 
 /* ******* Dungeon Instance Maps ******* */
 
-InstanceMap::InstanceMap(uint32 id, std::chrono::seconds expiry, uint32 InstanceId, uint8 SpawnMode, Map* _parent)
+InstanceMap::InstanceMap(uint32 id, time_t expiry, uint32 InstanceId, uint8 SpawnMode, Map* _parent)
     : Map(id, expiry, InstanceId, SpawnMode, _parent),
       m_resetAfterUnload(false), m_unloadWhenEmpty(false),
       instance_data(nullptr), i_script_id(0)
@@ -3726,7 +3720,7 @@ uint32 InstanceMap::GetMaxResetDelay() const
 
 /* ******* Battleground Instance Maps ******* */
 
-BattlegroundMap::BattlegroundMap(uint32 id, std::chrono::seconds expiry, uint32 InstanceId, Map* _parent, uint8 spawnMode)
+BattlegroundMap::BattlegroundMap(uint32 id, time_t expiry, uint32 InstanceId, Map* _parent, uint8 spawnMode)
     : Map(id, expiry, InstanceId, spawnMode, _parent), m_bg(nullptr)
 {
     //lets initialize visibility distance for BG/Arenas
diff --git a/src/server/game/Maps/Map.h b/src/server/game/Maps/Map.h
index 9b607a1afbc90f..fff1c5785539c3 100644
--- a/src/server/game/Maps/Map.h
+++ b/src/server/game/Maps/Map.h
@@ -311,7 +311,7 @@ class Map : public GridRefMgr<NGridType>
 {
     friend class MapReference;
 public:
-    Map(uint32 id, std::chrono::seconds, uint32 InstanceId, uint8 SpawnMode, Map* _parent = nullptr);
+    Map(uint32 id, time_t, uint32 InstanceId, uint8 SpawnMode, Map* _parent = nullptr);
     ~Map() override;
 
     [[nodiscard]] MapEntry const* GetEntry() const { return i_mapEntry; }
@@ -346,12 +346,18 @@ class Map : public GridRefMgr<NGridType>
     virtual void InitVisibilityDistance();
 
     void PlayerRelocation(Player*, float x, float y, float z, float o);
-    void CreatureRelocation(Creature* creature, float x, float y, float z, float o);
-    void GameObjectRelocation(GameObject* go, float x, float y, float z, float o);
+    void CreatureRelocation(Creature* creature, float x, float y, float z, float o, bool respawnRelocationOnFail = true);
+    void GameObjectRelocation(GameObject* go, float x, float y, float z, float o, bool respawnRelocationOnFail = true);
     void DynamicObjectRelocation(DynamicObject* go, float x, float y, float z, float o);
 
     template<class T, class CONTAINER> void Visit(const Cell& cell, TypeContainerVisitor<T, CONTAINER>& visitor);
 
+    [[nodiscard]] bool IsActiveGrid(float x, float y) const
+    {
+        GridCoord p = Acore::ComputeGridCoord(x, y);
+        return !getNGrid(p.x_coord, p.y_coord) || getNGrid(p.x_coord, p.y_coord)->GetGridState() == GRID_STATE_ACTIVE;
+    }
+
     [[nodiscard]] bool IsRemovalGrid(float x, float y) const
     {
         GridCoord p = Acore::ComputeGridCoord(x, y);
@@ -374,10 +380,10 @@ class Map : public GridRefMgr<NGridType>
 
     void ResetGridExpiry(NGridType& grid, float factor = 1) const
     {
-        grid.ResetTimeTracker(std::chrono::duration_cast<std::chrono::seconds>(i_gridExpiry * factor));
+        grid.ResetTimeTracker(time_t(float(i_gridExpiry) * factor));
     }
 
-    [[nodiscard]] std::chrono::seconds GetGridExpiry(void) const { return i_gridExpiry; }
+    [[nodiscard]] time_t GetGridExpiry(void) const { return i_gridExpiry; }
     [[nodiscard]] uint32 GetId() const { return i_mapEntry->MapID; }
 
     static void InitStateMachine();
@@ -702,9 +708,6 @@ class Map : public GridRefMgr<NGridType>
     }
 
     bool EnsureGridLoaded(Cell const&);
-    [[nodiscard]] bool isGridObjectDataLoaded(uint32 x, uint32 y) const { return getNGrid(x, y)->isGridObjectDataLoaded(); }
-    void setGridObjectDataLoaded(bool pLoaded, uint32 x, uint32 y) { getNGrid(x, y)->setGridObjectDataLoaded(pLoaded); }
-
     void setNGrid(NGridType* grid, uint32 x, uint32 y);
     void ScriptsProcess();
 
@@ -750,7 +753,7 @@ class Map : public GridRefMgr<NGridType>
     void _ScriptProcessDoor(Object* source, Object* target, const ScriptInfo* scriptInfo) const;
     GameObject* _FindGameObject(WorldObject* pWorldObject, ObjectGuid::LowType guid) const;
 
-    std::chrono::seconds i_gridExpiry;
+    time_t i_gridExpiry;
 
     //used for fast base_map (e.g. MapInstanced class object) search for
     //InstanceMaps and BattlegroundMaps...
@@ -839,7 +842,7 @@ enum InstanceResetMethod
 class InstanceMap : public Map
 {
 public:
-    InstanceMap(uint32 id, std::chrono::seconds, uint32 InstanceId, uint8 SpawnMode, Map* _parent);
+    InstanceMap(uint32 id, time_t, uint32 InstanceId, uint8 SpawnMode, Map* _parent);
     ~InstanceMap() override;
     bool AddPlayerToMap(Player*) override;
     void RemovePlayerFromMap(Player*, bool) override;
@@ -873,7 +876,7 @@ class InstanceMap : public Map
 class BattlegroundMap : public Map
 {
 public:
-    BattlegroundMap(uint32 id, std::chrono::seconds, uint32 InstanceId, Map* _parent, uint8 spawnMode);
+    BattlegroundMap(uint32 id, time_t, uint32 InstanceId, Map* _parent, uint8 spawnMode);
     ~BattlegroundMap() override;
 
     bool AddPlayerToMap(Player*) override;
@@ -898,11 +901,12 @@ inline void Map::Visit(Cell const& cell, TypeContainerVisitor<T, CONTAINER>& vis
     const uint32 cell_x = cell.CellX();
     const uint32 cell_y = cell.CellY();
 
-    if (!cell.NoCreate() || IsGridLoaded(GridCoord(x, y)))
-    {
+    if (!cell.NoCreate())
         EnsureGridLoaded(cell);
-        getNGrid(x, y)->VisitGrid(cell_x, cell_y, visitor);
-    }
+
+    NGridType* grid = getNGrid(x, y);
+    if (grid && grid->isGridObjectDataLoaded())
+        grid->VisitGrid(cell_x, cell_y, visitor);
 }
 
 #endif
diff --git a/src/server/game/Maps/MapInstanced.cpp b/src/server/game/Maps/MapInstanced.cpp
index 2ce5bbfbc108e4..36b593010eb492 100644
--- a/src/server/game/Maps/MapInstanced.cpp
+++ b/src/server/game/Maps/MapInstanced.cpp
@@ -25,8 +25,9 @@
 #include "Player.h"
 #include "ScriptMgr.h"
 #include "VMapFactory.h"
+#include "VMapMgr2.h"
 
-MapInstanced::MapInstanced(uint32 id, std::chrono::seconds expiry) : Map(id, expiry, 0, DUNGEON_DIFFICULTY_NORMAL)
+MapInstanced::MapInstanced(uint32 id, time_t expiry) : Map(id, expiry, 0, DUNGEON_DIFFICULTY_NORMAL)
 {
     // fill with zero
     memset(&GridMapReference, 0, MAX_NUMBER_OF_GRIDS * MAX_NUMBER_OF_GRIDS * sizeof(uint16));
@@ -260,6 +261,15 @@ bool MapInstanced::DestroyInstance(InstancedMaps::iterator& itr)
     sScriptMgr->OnDestroyInstance(this, itr->second);
 
     itr->second->UnloadAll();
+    // should only unload VMaps if this is the last instance
+    if (m_InstancedMaps.size() <= 1)
+    {
+        VMAP::VMapFactory::createOrGetVMapMgr()->unloadMap(itr->second->GetId());
+        MMAP::MMapFactory::createOrGetMMapMgr()->unloadMap(itr->second->GetId());
+        // in that case, unload grids of the base map, too
+        // so in the next map creation, (EnsureGridCreated actually) VMaps will be reloaded
+        Map::UnloadAll();
+    }
 
     // erase map
     delete itr->second;
diff --git a/src/server/game/Maps/MapInstanced.h b/src/server/game/Maps/MapInstanced.h
index fd86b8fa612973..e2deef1575290e 100644
--- a/src/server/game/Maps/MapInstanced.h
+++ b/src/server/game/Maps/MapInstanced.h
@@ -28,7 +28,7 @@ class MapInstanced : public Map
 public:
     using InstancedMaps = std::unordered_map<uint32, Map*>;
 
-    MapInstanced(uint32 id, std::chrono::seconds expiry);
+    MapInstanced(uint32 id, time_t expiry);
     ~MapInstanced() override {}
 
     // functions overwrite Map versions
diff --git a/src/server/game/Maps/MapMgr.cpp b/src/server/game/Maps/MapMgr.cpp
index 980b7898fd9737..5c95475fb73375 100644
--- a/src/server/game/Maps/MapMgr.cpp
+++ b/src/server/game/Maps/MapMgr.cpp
@@ -84,10 +84,10 @@ Map* MapMgr::CreateBaseMap(uint32 id)
             ASSERT(entry);
 
             if (entry->Instanceable())
-                map = new MapInstanced(id, std::chrono::seconds(i_gridCleanUpDelay));
+                map = new MapInstanced(id, i_gridCleanUpDelay);
             else
             {
-                map = new Map(id, std::chrono::seconds(i_gridCleanUpDelay), 0, REGULAR_DIFFICULTY);
+                map = new Map(id, i_gridCleanUpDelay, 0, REGULAR_DIFFICULTY);
                 map->LoadRespawnTimes();
                 map->LoadCorpseData();
             }
diff --git a/src/server/game/Maps/TransportMgr.cpp b/src/server/game/Maps/TransportMgr.cpp
index e6ad171d38ee9a..5d7a65f64bc045 100644
--- a/src/server/game/Maps/TransportMgr.cpp
+++ b/src/server/game/Maps/TransportMgr.cpp
@@ -411,8 +411,6 @@ MotionTransport* TransportMgr::CreateTransport(uint32 entry, ObjectGuid::LowType
     if (map && map->IsDungeon())
         trans->m_zoneScript = map->ToInstanceMap()->GetInstanceScript();
 
-    // xinef: transports are active so passengers can be relocated (grids must be loaded)
-    trans->setActive(true);
     HashMapHolder<MotionTransport>::Insert(trans);
     trans->GetMap()->AddToMap<MotionTransport>(trans);
     return trans;
diff --git a/src/server/game/Misc/DynamicVisibility.cpp b/src/server/game/Misc/DynamicVisibility.cpp
deleted file mode 100644
index 60889c4bcc34cd..00000000000000
--- a/src/server/game/Misc/DynamicVisibility.cpp
+++ /dev/null
@@ -1,28 +0,0 @@
-/*
- * This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Affero General Public License as published by the
- * Free Software Foundation; either version 3 of the License, or (at your
- * option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include "DynamicVisibility.h"
-
-uint8 DynamicVisibilityMgr::visibilitySettingsIndex = 0;
-
-void DynamicVisibilityMgr::Update(uint32 sessionCount)
-{
-    if (sessionCount >= (visibilitySettingsIndex + 1) * ((uint32)VISIBILITY_SETTINGS_PLAYER_INTERVAL) && visibilitySettingsIndex < VISIBILITY_SETTINGS_MAX_INTERVAL_NUM - 1)
-        ++visibilitySettingsIndex;
-    else if (visibilitySettingsIndex && sessionCount < visibilitySettingsIndex * ((uint32)VISIBILITY_SETTINGS_PLAYER_INTERVAL) - 100)
-        --visibilitySettingsIndex;
-}
diff --git a/src/server/game/Misc/DynamicVisibility.h b/src/server/game/Misc/DynamicVisibility.h
deleted file mode 100644
index cf38bfa50a8648..00000000000000
--- a/src/server/game/Misc/DynamicVisibility.h
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Affero General Public License as published by the
- * Free Software Foundation; either version 3 of the License, or (at your
- * option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef __DYNAMICVISIBILITY_H
-#define __DYNAMICVISIBILITY_H
-
-#include "Common.h"
-
-struct VisibilitySettingData
-{
-    uint32 visibilityNotifyDelay;
-    uint32 aiNotifyDelay;
-    float requiredMoveDistanceSq;
-};
-
-// pussywizard: dynamic visibility settings
-// 7 player intervals: 0-499, 500-999, 1000-1499, 1500-1999, 2000-2499, 2500-2999, 3000+
-// 5 map types: common, instance, raid, bg, arena
-// feel free to add more intervals, change existing ones or move to conf file :P
-#define VISIBILITY_SETTINGS_PLAYER_INTERVAL 500
-#define VISIBILITY_SETTINGS_MAX_INTERVAL_NUM 7
-const VisibilitySettingData VisibilitySettings[VISIBILITY_SETTINGS_MAX_INTERVAL_NUM][5] =
-{
-    { {300, 150, 1.0f}, {300, 150, 1.0f}, {300, 150, 1.0f}, {300, 150, 1.0f}, {300, 150, 1.0f} }, // 0-499
-    { {400, 200, 2.25f}, {400, 200, 2.25f}, {400, 200, 2.25f}, {300, 150, 1.0f}, {300, 150, 1.0f} }, // 500-999
-    { {500, 250, 4.0f}, {500, 250, 4.0f}, {500, 250, 4.0f}, {400, 200, 2.25f}, {300, 150, 1.0f} }, // 1000-1499
-    { {700, 350, 6.25f}, {700, 350, 6.25f}, {700, 350, 6.25f}, {600, 300, 6.25f}, {300, 200, 1.0f} }, // 1500-1999
-    { {1000, 500, 16.0f}, {1000, 500, 16.0f}, {1000, 500, 16.0f}, {1000, 500, 16.0f}, {300, 250, 1.0f} }, // 2000-2499
-    { {1000, 500, 16.0f}, {1000, 500, 16.0f}, {1000, 500, 16.0f}, {1000, 500, 16.0f}, {300, 350, 1.0f} }, // 2500-2999
-    { {1200, 550, 20.0f}, {1200, 550, 25.0f}, {1200, 550, 25.0f}, {1100, 550, 16.0f}, {300, 350, 1.0f} } // 3000+
-};
-
-class DynamicVisibilityMgr
-{
-public:
-    static void Update(uint32 sessionCount);
-    static uint32 GetVisibilityNotifyDelay(uint32 map_type) { return VisibilitySettings[visibilitySettingsIndex][map_type].visibilityNotifyDelay; }
-    static uint32 GetAINotifyDelay(uint32 map_type) { return VisibilitySettings[visibilitySettingsIndex][map_type].aiNotifyDelay; }
-    static float GetReqMoveDistSq(uint32 map_type) { return VisibilitySettings[visibilitySettingsIndex][map_type].requiredMoveDistanceSq; }
-protected:
-    static uint8 visibilitySettingsIndex;
-};
-
-#endif
diff --git a/src/server/game/Movement/Spline/MoveSpline.cpp b/src/server/game/Movement/Spline/MoveSpline.cpp
index 3d3be3769b2c2e..0d230ee1a1b4ce 100644
--- a/src/server/game/Movement/Spline/MoveSpline.cpp
+++ b/src/server/game/Movement/Spline/MoveSpline.cpp
@@ -125,14 +125,13 @@ namespace Movement
         if (args.flags.cyclic)
         {
             uint32 cyclic_point = 0;
-            // MoveSplineFlag::Enter_Cycle support dropped
-            //if (splineflags & SPLINEFLAG_ENTER_CYCLE)
-            //cyclic_point = 1;   // shouldn't be modified, came from client
-            spline.init_cyclic_spline(&args.path[0], args.path.size(), modes[args.flags.isSmooth()], cyclic_point);
+            if (splineflags.enter_cycle)
+                cyclic_point = 1;   // shouldn't be modified, came from client
+            spline.init_cyclic_spline(&args.path[0], args.path.size(), modes[args.flags.isSmooth()], cyclic_point, args.initialOrientation);
         }
         else
         {
-            spline.init_spline(&args.path[0], args.path.size(), modes[args.flags.isSmooth()]);
+            spline.init_spline(&args.path[0], args.path.size(), modes[args.flags.isSmooth()], args.initialOrientation);
         }
 
         // init spline timestamps
@@ -204,7 +203,7 @@ namespace Movement
         if (!(exp)) \
         { \
             if (unit) \
-                LOG_ERROR("misc.movesplineinitargs", "MoveSplineInitArgs::Validate: expression '{}' failed for {}", #exp, unit->GetGUID().ToString()); \
+                LOG_ERROR("misc.movesplineinitargs", "MoveSplineInitArgs::Validate: expression '{}' failed for GUID: {} Entry: {}", #exp, unit->GetGUID().ToString().c_str(), unit->GetEntry());\
             else \
                 LOG_ERROR("misc.movesplineinitargs", "MoveSplineInitArgs::Validate: expression '{}' failed for cyclic spline continuation", #exp); \
             return false;\
@@ -273,6 +272,41 @@ namespace Movement
                     point_Idx = spline.first();
                     time_passed = time_passed % Duration();
                     result = Movement::MoveSpline::UpdateResult(Result_NextCycle | Result_JustArrived);
+
+                    // Remove first point from the path after one full cycle.
+                    // That point was the position of the unit prior to entering the cycle and it shouldn't be repeated with continuous cycles.
+                    if (splineflags.enter_cycle)
+                    {
+                        splineflags.enter_cycle = false;
+
+                        MoveSplineInitArgs args{ (size_t)spline.getPointCount() };
+                        args.path.assign(spline.getPoints().begin() + spline.first() + 1, spline.getPoints().begin() + spline.last());
+                        args.facing = facing;
+                        args.flags = splineflags;
+                        args.path_Idx_offset = point_Idx_offset;
+                        // MoveSplineFlag::Parabolic | MoveSplineFlag::Animation not supported currently
+                            //args.parabolic_amplitude = ?;
+                            //args.time_perc = ?;
+                        args.splineId = m_Id;
+                        args.initialOrientation = initialOrientation;
+                        args.velocity = 1.0f; // Calculated below
+                        args.HasVelocity = true;
+                        args.TransformForTransport = onTransport;
+                        if (args.Validate(nullptr))
+                        {
+                            // New cycle should preserve previous cycle's duration for some weird reason, even though
+                            // the path is really different now. Blizzard is weird. Or this was just a simple oversight.
+                            // Since our splines precalculate length with velocity in mind, if we want to find the desired
+                            // velocity, we have to make a fake spline, calculate its duration and then compare it to the
+                            // desired duration, thus finding out how much the velocity has to be increased for them to match.
+                            MoveSpline tempSpline;
+                            tempSpline.Initialize(args);
+                            args.velocity = (float)tempSpline.Duration() / Duration();
+
+                            if (args.Validate(nullptr))
+                                init_spline(args);
+                        }
+                    }
                 }
                 else
                 {
diff --git a/src/server/game/Movement/Spline/MoveSplineInit.cpp b/src/server/game/Movement/Spline/MoveSplineInit.cpp
index faf6cd203de8e2..0696a24495d341 100644
--- a/src/server/game/Movement/Spline/MoveSplineInit.cpp
+++ b/src/server/game/Movement/Spline/MoveSplineInit.cpp
@@ -87,6 +87,7 @@ namespace Movement
         // corrent first vertex
         args.path[0] = real_position;
         args.initialOrientation = real_position.orientation;
+        args.flags.enter_cycle = args.flags.cyclic;
         move_spline.onTransport = transport;
 
         uint32 moveFlags = unit->m_movementInfo.GetMovementFlags();
diff --git a/src/server/game/Movement/Spline/MovementPacketBuilder.cpp b/src/server/game/Movement/Spline/MovementPacketBuilder.cpp
index b360c6b3dc292a..d9e31d5e763900 100644
--- a/src/server/game/Movement/Spline/MovementPacketBuilder.cpp
+++ b/src/server/game/Movement/Spline/MovementPacketBuilder.cpp
@@ -67,10 +67,6 @@ namespace Movement
                 break;
         }
 
-        // add fake Enter_Cycle flag - needed for client-side cyclic movement (client will erase first spline vertex after first cycle done)
-        // Xinef: this flag breaks cycle for ground movement, client teleports npc between last and first point instead of using smooth movement
-        if (splineflags & MoveSplineFlag::Flying)
-            splineflags.enter_cycle = move_spline.isCyclic();
         data << uint32(splineflags & uint32(~MoveSplineFlag::Mask_No_Monster_Move));
 
         if (splineflags.animation)
@@ -123,20 +119,11 @@ namespace Movement
         data.append<Vector3>(&spline.getPoint(2), count);
     }
 
-    void WriteCatmullRomCyclicPath(const Spline<int32>& spline, ByteBuffer& data, bool flying)
+    void WriteCatmullRomCyclicPath(const Spline<int32>& spline, ByteBuffer& data)
     {
-        uint32 count = spline.getPointCount() - 3;
-        data << uint32(count + 1);
-        if (flying)
-        {
-            data << spline.getPoint(1); // fake point, client will erase it from the spline after first cycle done
-            data.append<Vector3>(&spline.getPoint(2), count);
-        }
-        else
-        {
-            data.append<Vector3>(&spline.getPoint(2), count);
-            data << Vector3::zero(); //Xinef: fake point
-        }
+        uint32 count = spline.getPointCount() - 4;
+        data << count;
+        data.append<Vector3>(&spline.getPoint(2), count);
     }
 
     void PacketBuilder::WriteMonsterMove(const MoveSpline& move_spline, ByteBuffer& data)
@@ -148,7 +135,7 @@ namespace Movement
         if (splineflags & MoveSplineFlag::Mask_CatmullRom)
         {
             if (splineflags.cyclic)
-                WriteCatmullRomCyclicPath(spline, data, splineflags & MoveSplineFlag::Flying);
+                WriteCatmullRomCyclicPath(spline, data);
             else
                 WriteCatmullRomPath(spline, data);
         }
@@ -199,4 +186,8 @@ namespace Movement
             data << (move_spline.isCyclic() ? Vector3::zero() : move_spline.FinalDestination());
         }
     }
+    void PacketBuilder::WriteSplineSync(MoveSpline const& move_spline, ByteBuffer& data)
+    {
+        data << (float)move_spline.timePassed() / move_spline.Duration();
+    }
 }
diff --git a/src/server/game/Movement/Spline/MovementPacketBuilder.h b/src/server/game/Movement/Spline/MovementPacketBuilder.h
index 711eccc33e888e..2c577a492a6511 100644
--- a/src/server/game/Movement/Spline/MovementPacketBuilder.h
+++ b/src/server/game/Movement/Spline/MovementPacketBuilder.h
@@ -38,6 +38,7 @@ namespace Movement
         static void WriteMonsterMove(const MoveSpline& mov, ByteBuffer& data);
         static void WriteStopMovement(Vector3 const& loc, uint32 splineId, ByteBuffer& data);
         static void WriteCreate(const MoveSpline& mov, ByteBuffer& data);
+        static void WriteSplineSync(MoveSpline const& mov, ByteBuffer& data);
     };
 }
 #endif // AC_PACKET_BUILDER_H
diff --git a/src/server/game/Movement/Spline/Spline.cpp b/src/server/game/Movement/Spline/Spline.cpp
index 601951a20a9788..31bf6a6cb0b737 100644
--- a/src/server/game/Movement/Spline/Spline.cpp
+++ b/src/server/game/Movement/Spline/Spline.cpp
@@ -199,23 +199,25 @@ namespace Movement
         return length;
     }
 
-    void SplineBase::init_spline(const Vector3* controls, index_type count, EvaluationMode m)
+    void SplineBase::init_spline(const Vector3* controls, index_type count, EvaluationMode m, float orientation)
     {
         m_mode = m;
         cyclic = false;
+        initialOrientation = orientation;
 
-        (this->*initializers[m_mode])(controls, count, cyclic, 0);
+        (this->*initializers[m_mode])(controls, count, 0);
     }
 
-    void SplineBase::init_cyclic_spline(const Vector3* controls, index_type count, EvaluationMode m, index_type cyclic_point)
+    void SplineBase::init_cyclic_spline(const Vector3* controls, index_type count, EvaluationMode m, index_type cyclic_point, float orientation)
     {
         m_mode = m;
         cyclic = true;
+        initialOrientation = orientation;
 
-        (this->*initializers[m_mode])(controls, count, cyclic, cyclic_point);
+        (this->*initializers[m_mode])(controls, count, cyclic_point);
     }
 
-    void SplineBase::InitLinear(const Vector3* controls, index_type count, bool cyclic, index_type cyclic_point)
+    void SplineBase::InitLinear(const Vector3* controls, index_type count, index_type cyclic_point)
     {
         ASSERT(count >= 2);
         const int real_size = count + 1;
@@ -235,7 +237,7 @@ namespace Movement
         index_hi = cyclic ? count : (count - 1);
     }
 
-    void SplineBase::InitCatmullRom(const Vector3* controls, index_type count, bool cyclic, index_type cyclic_point)
+    void SplineBase::InitCatmullRom(const Vector3* controls, index_type count, index_type cyclic_point)
     {
         const int real_size = count + (cyclic ? (1 + 2) : (1 + 1));
 
@@ -253,14 +255,14 @@ namespace Movement
             if (cyclic_point == 0)
                 points[0] = controls[count - 1];
             else
-                points[0] = controls[0].lerp(controls[1], -1);
+                points[0] = controls[0] - G3D::Vector3{ std::cos(initialOrientation), std::sin(initialOrientation), 0.0f };
 
             points[high_index + 1] = controls[cyclic_point];
             points[high_index + 2] = controls[cyclic_point + 1];
         }
         else
         {
-            points[0] = controls[0].lerp(controls[1], -1);
+            points[0] = controls[0] - G3D::Vector3{ std::cos(initialOrientation), std::sin(initialOrientation), 0.0f };
             points[high_index + 1] = controls[count - 1];
         }
 
@@ -268,7 +270,7 @@ namespace Movement
         index_hi = high_index + (cyclic ? 1 : 0);
     }
 
-    void SplineBase::InitBezier3(const Vector3* controls, index_type count, bool /*cyclic*/, index_type /*cyclic_point*/)
+    void SplineBase::InitBezier3(const Vector3* controls, index_type count, index_type /*cyclic_point*/)
     {
         index_type c = count / 3u * 3u;
         index_type t = c / 3u;
diff --git a/src/server/game/Movement/Spline/Spline.h b/src/server/game/Movement/Spline/Spline.h
index d9d255f0a2dc4a..afefffe6249b00 100644
--- a/src/server/game/Movement/Spline/Spline.h
+++ b/src/server/game/Movement/Spline/Spline.h
@@ -48,6 +48,7 @@ namespace Movement
 
         uint8 m_mode{UninitializedMode};
         bool cyclic{false};
+        float initialOrientation;
 
         enum
         {
@@ -77,15 +78,15 @@ namespace Movement
         typedef float (SplineBase::*SegLenghtMethtod)(index_type) const;
         static SegLenghtMethtod seglengths[ModesEnd];
 
-        void InitLinear(const Vector3*, index_type, bool, index_type);
-        void InitCatmullRom(const Vector3*, index_type, bool, index_type);
-        void InitBezier3(const Vector3*, index_type, bool, index_type);
-        typedef void (SplineBase::*InitMethtod)(const Vector3*, index_type, bool, index_type);
+        void InitLinear(const Vector3*, index_type, index_type);
+        void InitCatmullRom(const Vector3*, index_type, index_type);
+        void InitBezier3(const Vector3*, index_type, index_type);
+        typedef void (SplineBase::*InitMethtod)(const Vector3*, index_type, index_type);
         static InitMethtod initializers[ModesEnd];
 
         void UninitializedSplineEvaluationMethod(index_type, float, Vector3&) const { ABORT(); }
-        [[nodiscard]] float UninitializedSplineSegLenghtMethod(index_type) const { ABORT(); }
-        void UninitializedSplineInitMethod(Vector3 const*, index_type, bool, index_type) { ABORT(); }
+        [[nodiscard]] float UninitializedSplineSegLenghtMethod(index_type) const { ABORT(); return 0.0f; }
+        void UninitializedSplineInitMethod(Vector3 const*, index_type, index_type) { ABORT(); }
 
     public:
         explicit SplineBase()  = default;
@@ -116,8 +117,8 @@ namespace Movement
         [[nodiscard]] const Vector3& getPoint(index_type i) const { return points[i];}
 
         /** Initializes spline. Don't call other methods while spline not initialized. */
-        void init_spline(const Vector3* controls, index_type count, EvaluationMode m);
-        void init_cyclic_spline(const Vector3* controls, index_type count, EvaluationMode m, index_type cyclic_point);
+        void init_spline(const Vector3* controls, index_type count, EvaluationMode m, float orientation);
+        void init_cyclic_spline(const Vector3* controls, index_type count, EvaluationMode m, index_type cyclic_point, float orientation);
 
         /** As i can see there are a lot of ways how spline can be initialized
             would be no harm to have some custom initializers. */
@@ -170,8 +171,8 @@ namespace Movement
         void computeIndex(float t, index_type& out_idx, float& out_u) const;
 
         /** Initializes spline. Don't call other methods while spline not initialized. */
-        void init_spline(const Vector3* controls, index_type count, EvaluationMode m) { SplineBase::init_spline(controls, count, m);}
-        void init_cyclic_spline(const Vector3* controls, index_type count, EvaluationMode m, index_type cyclic_point) { SplineBase::init_cyclic_spline(controls, count, m, cyclic_point);}
+        void init_spline(const Vector3* controls, index_type count, EvaluationMode m, float orientation = 0) { SplineBase::init_spline(controls, count, m, orientation);}
+        void init_cyclic_spline(const Vector3* controls, index_type count, EvaluationMode m, index_type cyclic_point, float orientation = 0) { SplineBase::init_cyclic_spline(controls, count, m, cyclic_point, orientation);}
 
         /**  Initializes lengths with SplineBase::SegLength method. */
         void initLengths();
diff --git a/src/server/game/Spells/Auras/SpellAuraEffects.cpp b/src/server/game/Spells/Auras/SpellAuraEffects.cpp
index 431897eebcd84e..f8749091f46dbf 100644
--- a/src/server/game/Spells/Auras/SpellAuraEffects.cpp
+++ b/src/server/game/Spells/Auras/SpellAuraEffects.cpp
@@ -2435,7 +2435,7 @@ void AuraEffect::HandleFeignDeath(AuraApplication const* aurApp, uint8 mode, boo
         */
 
         UnitList targets;
-        Acore::AnyUnfriendlyUnitInObjectRangeCheck u_check(target, target, target->GetVisibilityRange()); // no VISIBILITY_COMPENSATION, distance is enough
+        Acore::AnyUnfriendlyUnitInObjectRangeCheck u_check(target, target, target->GetVisibilityRange());
         Acore::UnitListSearcher<Acore::AnyUnfriendlyUnitInObjectRangeCheck> searcher(target, targets, u_check);
         Cell::VisitAllObjects(target, searcher, target->GetMap()->GetVisibilityRange());
         for (UnitList::iterator iter = targets.begin(); iter != targets.end(); ++iter)
diff --git a/src/server/game/Spells/SpellEffects.cpp b/src/server/game/Spells/SpellEffects.cpp
index 7080b5c8f3f8f7..da94ce4ede4458 100644
--- a/src/server/game/Spells/SpellEffects.cpp
+++ b/src/server/game/Spells/SpellEffects.cpp
@@ -4048,7 +4048,7 @@ void Spell::EffectSanctuary(SpellEffIndex /*effIndex*/)
     }
 
     UnitList targets;
-    Acore::AnyUnfriendlyUnitInObjectRangeCheck u_check(unitTarget, unitTarget, unitTarget->GetVisibilityRange()); // no VISIBILITY_COMPENSATION, distance is enough
+    Acore::AnyUnfriendlyUnitInObjectRangeCheck u_check(unitTarget, unitTarget, unitTarget->GetVisibilityRange());
     Acore::UnitListSearcher<Acore::AnyUnfriendlyUnitInObjectRangeCheck> searcher(unitTarget, targets, u_check);
     Cell::VisitAllObjects(unitTarget, searcher, unitTarget->GetVisibilityRange());
     for (UnitList::iterator iter = targets.begin(); iter != targets.end(); ++iter)
@@ -4787,7 +4787,7 @@ void Spell::EffectForceDeselect(SpellEffIndex /*effIndex*/)
     WorldPacket data(SMSG_CLEAR_TARGET, 8);
     data << m_caster->GetGUID();
 
-    float dist = m_caster->GetVisibilityRange() + VISIBILITY_COMPENSATION;
+    float dist = m_caster->GetVisibilityRange();
     Acore::MessageDistDelivererToHostile notifier(m_caster, &data, dist);
     Cell::VisitWorldObjects(m_caster, notifier, dist);
 
@@ -4812,7 +4812,7 @@ void Spell::EffectForceDeselect(SpellEffIndex /*effIndex*/)
             return;
 
         UnitList targets;
-        Acore::AnyUnfriendlyUnitInObjectRangeCheck u_check(m_caster, m_caster, m_caster->GetVisibilityRange()); // no VISIBILITY_COMPENSATION, distance is enough
+        Acore::AnyUnfriendlyUnitInObjectRangeCheck u_check(m_caster, m_caster, m_caster->GetVisibilityRange());
         Acore::UnitListSearcher<Acore::AnyUnfriendlyUnitInObjectRangeCheck> searcher(m_caster, targets, u_check);
         Cell::VisitAllObjects(m_caster, searcher, m_caster->GetVisibilityRange());
         for (UnitList::iterator iter = targets.begin(); iter != targets.end(); ++iter)
diff --git a/src/server/game/World/World.cpp b/src/server/game/World/World.cpp
index f41e523b890614..d301a1d2640a8b 100644
--- a/src/server/game/World/World.cpp
+++ b/src/server/game/World/World.cpp
@@ -44,7 +44,6 @@
 #include "DBCStores.h"
 #include "DatabaseEnv.h"
 #include "DisableMgr.h"
-#include "DynamicVisibility.h"
 #include "GameEventMgr.h"
 #include "GameGraveyard.h"
 #include "GameTime.h"
@@ -2255,8 +2254,6 @@ void World::Update(uint32 diff)
     // Record update if recording set in log and diff is greater then minimum set in log
     sWorldUpdateTime.RecordUpdateTime(GameTime::GetGameTimeMS(), diff, GetActiveSessionCount());
 
-    DynamicVisibilityMgr::Update(GetActiveSessionCount());
-
     ///- Update the different timers
     for (int i = 0; i < WUPDATE_COUNT; ++i)
     {
diff --git a/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/boss_nefarian.cpp b/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/boss_nefarian.cpp
index 8ebc9569b02e74..f52225e7664eb2 100644
--- a/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/boss_nefarian.cpp
+++ b/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/boss_nefarian.cpp
@@ -327,6 +327,7 @@ class boss_victor_nefarius : public CreatureScript
                     if (Creature* nefarian = me->SummonCreature(NPC_NEFARIAN, NefarianSpawn))
                     {
                         nefarian->setActive(true);
+                        nefarian->SetFarVisible(true);
                         nefarian->SetCanFly(true);
                         nefarian->SetDisableGravity(true);
                         nefarian->GetMotionMaster()->MovePath(NEFARIAN_PATH, false);
diff --git a/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/instance_blackwing_lair.cpp b/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/instance_blackwing_lair.cpp
index a8aac9757fde45..faddef61782f46 100644
--- a/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/instance_blackwing_lair.cpp
+++ b/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/instance_blackwing_lair.cpp
@@ -425,6 +425,7 @@ class instance_blackwing_lair : public InstanceMapScript
                         {
                             nefarius->SetPhaseMask(1, true);
                             nefarius->setActive(true);
+                            nefarius->SetFarVisible(true);
                             nefarius->Respawn();
                             nefarius->GetMotionMaster()->MoveTargetedHome();
                         }
diff --git a/src/server/scripts/EasternKingdoms/Karazhan/boss_nightbane.cpp b/src/server/scripts/EasternKingdoms/Karazhan/boss_nightbane.cpp
index 72ef3e5dd3e3f8..71fd064502ef78 100644
--- a/src/server/scripts/EasternKingdoms/Karazhan/boss_nightbane.cpp
+++ b/src/server/scripts/EasternKingdoms/Karazhan/boss_nightbane.cpp
@@ -105,6 +105,7 @@ struct boss_nightbane : public BossAI
         me->SetDisableGravity(_intro);
         me->SetWalk(false);
         me->setActive(true);
+        me->SetFarVisible(true);
 
         if (instance)
         {
diff --git a/src/server/scripts/EasternKingdoms/ScarletEnclave/zone_the_scarlet_enclave.cpp b/src/server/scripts/EasternKingdoms/ScarletEnclave/zone_the_scarlet_enclave.cpp
index 8d48baefaffa71..cc26b66c847f4c 100644
--- a/src/server/scripts/EasternKingdoms/ScarletEnclave/zone_the_scarlet_enclave.cpp
+++ b/src/server/scripts/EasternKingdoms/ScarletEnclave/zone_the_scarlet_enclave.cpp
@@ -55,6 +55,7 @@ class npc_valkyr_battle_maiden : public CreatureScript
         void Reset() override
         {
             me->setActive(true);
+            me->SetFarVisible(true);
             me->SetVisible(false);
             me->SetUnitFlag(UNIT_FLAG_NON_ATTACKABLE);
             me->SetCanFly(true);
diff --git a/src/server/scripts/Kalimdor/CavernsOfTime/BattleForMountHyjal/hyjalAI.cpp b/src/server/scripts/Kalimdor/CavernsOfTime/BattleForMountHyjal/hyjalAI.cpp
index 42817e7950fe28..a309d4bc35237b 100644
--- a/src/server/scripts/Kalimdor/CavernsOfTime/BattleForMountHyjal/hyjalAI.cpp
+++ b/src/server/scripts/Kalimdor/CavernsOfTime/BattleForMountHyjal/hyjalAI.cpp
@@ -347,6 +347,7 @@ void hyjalAI::Reset()
 {
     IsDummy = false;
     me->setActive(true);
+    me->SetFarVisible(true);
     // GUIDs
     PlayerGUID.Clear();
     BossGUID[0].Clear();
@@ -493,6 +494,7 @@ void hyjalAI::SummonCreature(uint32 entry, float Base[4][3])
 
         creature->SetWalk(false);
         creature->setActive(true);
+        creature->SetFarVisible(true);
         switch (entry)
         {
             case NECROMANCER:
@@ -1021,6 +1023,7 @@ void hyjalAI::DoOverrun(uint32 faction, const uint32 diff)
                     CAST_AI(hyjal_trashAI, unit->AI())->IsOverrun = true;
                     CAST_AI(hyjal_trashAI, unit->AI())->OverrunType = i;
                     unit->setActive(true);
+                    unit->SetFarVisible(true);
                 }
             }
             for (uint8 i = 0; i < 3; ++i)//summon 3 abominations
@@ -1033,6 +1036,7 @@ void hyjalAI::DoOverrun(uint32 faction, const uint32 diff)
                     CAST_AI(hyjal_trashAI, unit->AI())->IsOverrun = true;
                     CAST_AI(hyjal_trashAI, unit->AI())->OverrunType = i;
                     unit->setActive(true);
+                    unit->SetFarVisible(true);
                 }
             }
             for (uint8 i = 0; i < 5; ++i)//summon 5 gargoyles
@@ -1045,6 +1049,7 @@ void hyjalAI::DoOverrun(uint32 faction, const uint32 diff)
                     CAST_AI(hyjal_trashAI, unit->AI())->IsOverrun = true;
                     CAST_AI(hyjal_trashAI, unit->AI())->OverrunType = i;
                     unit->setActive(true);
+                    unit->SetFarVisible(true);
                 }
             }
             break;
@@ -1062,6 +1067,7 @@ void hyjalAI::DoOverrun(uint32 faction, const uint32 diff)
                     CAST_AI(hyjal_trashAI, unit->AI())->IsOverrun = true;
                     CAST_AI(hyjal_trashAI, unit->AI())->OverrunType = i;
                     unit->setActive(true);
+                    unit->SetFarVisible(true);
                 }
             }
             for (uint8 i = 0; i < 25; ++i)//summon 25 ghouls
@@ -1074,6 +1080,7 @@ void hyjalAI::DoOverrun(uint32 faction, const uint32 diff)
                     CAST_AI(hyjal_trashAI, unit->AI())->IsOverrun = true;
                     CAST_AI(hyjal_trashAI, unit->AI())->OverrunType = i;
                     unit->setActive(true);
+                    unit->SetFarVisible(true);
                 }
             }
             for (uint8 i = 0; i < 5; ++i)//summon 5 abominations
@@ -1086,6 +1093,7 @@ void hyjalAI::DoOverrun(uint32 faction, const uint32 diff)
                     CAST_AI(hyjal_trashAI, unit->AI())->IsOverrun = true;
                     CAST_AI(hyjal_trashAI, unit->AI())->OverrunType = i;
                     unit->setActive(true);
+                    unit->SetFarVisible(true);
                 }
             }
             break;
diff --git a/src/server/scripts/Northrend/ChamberOfAspects/RubySanctum/boss_baltharus_the_warborn.cpp b/src/server/scripts/Northrend/ChamberOfAspects/RubySanctum/boss_baltharus_the_warborn.cpp
index ec44989251752e..8297d8904b6cde 100644
--- a/src/server/scripts/Northrend/ChamberOfAspects/RubySanctum/boss_baltharus_the_warborn.cpp
+++ b/src/server/scripts/Northrend/ChamberOfAspects/RubySanctum/boss_baltharus_the_warborn.cpp
@@ -389,6 +389,7 @@ class npc_xerestrasza : public CreatureScript
             if (action == ACTION_BALTHARUS_DEATH)
             {
                 me->setActive(true);
+                me->SetFarVisible(true);
                 _isIntro = false;
 
                 _events.ScheduleEvent(EVENT_XERESTRASZA_EVENT_0, 6s);
diff --git a/src/server/scripts/Northrend/IcecrownCitadel/boss_sindragosa.cpp b/src/server/scripts/Northrend/IcecrownCitadel/boss_sindragosa.cpp
index 968fcba474b53b..d03ad2745d8163 100644
--- a/src/server/scripts/Northrend/IcecrownCitadel/boss_sindragosa.cpp
+++ b/src/server/scripts/Northrend/IcecrownCitadel/boss_sindragosa.cpp
@@ -339,6 +339,7 @@ class boss_sindragosa : public CreatureScript
             events.ScheduleEvent(EVENT_ICY_GRIP, 33s + 500ms, EVENT_GROUP_LAND_PHASE);
 
             me->setActive(true);
+            me->SetFarVisible(true);
             me->SetInCombatWithZone();
             instance->SetBossState(DATA_SINDRAGOSA, IN_PROGRESS);
 
@@ -377,6 +378,7 @@ class boss_sindragosa : public CreatureScript
                     return;
 
                 me->setActive(true);
+                me->SetFarVisible(true);
                 me->SetDisableGravity(true);
                 me->SetUnitFlag(UNIT_FLAG_NON_ATTACKABLE);
                 me->SetSpeed(MOVE_RUN, 4.28571f);
@@ -1407,6 +1409,7 @@ class npc_spinestalker : public CreatureScript
                     return;
 
                 me->setActive(true);
+                me->SetFarVisible(true);
                 me->SetImmuneToPC(true);
                 float moveTime = me->GetExactDist(&SpinestalkerFlyPos) / (me->GetSpeed(MOVE_RUN) * 0.001f);
                 me->m_Events.AddEvent(new FrostwyrmLandEvent(*me, SpinestalkerLandPos), me->m_Events.CalculateTime(uint64(moveTime) + 250));
@@ -1423,6 +1426,7 @@ class npc_spinestalker : public CreatureScript
                 return;
 
             me->setActive(false);
+            me->SetFarVisible(false);
             me->SetDisableGravity(false);
             me->SetHomePosition(SpinestalkerLandPos);
             me->SetFacingTo(SpinestalkerLandPos.GetOrientation());
@@ -1538,6 +1542,7 @@ class npc_rimefang : public CreatureScript
                     return;
 
                 me->setActive(true);
+                me->SetFarVisible(true);
                 me->SetImmuneToPC(true);
                 float moveTime = me->GetExactDist(&RimefangFlyPos) / (me->GetSpeed(MOVE_RUN) * 0.001f);
                 me->m_Events.AddEvent(new FrostwyrmLandEvent(*me, RimefangLandPos), me->m_Events.CalculateTime(uint64(moveTime) + 250));
@@ -1556,6 +1561,8 @@ class npc_rimefang : public CreatureScript
             if (point == POINT_FROSTWYRM_LAND)
             {
                 me->setActive(false);
+                me->SetFarVisible(false);
+                me->SetFarVisible(false);
                 me->SetDisableGravity(false);
                 me->SetHomePosition(RimefangLandPos);
                 me->SetFacingTo(RimefangLandPos.GetOrientation());
diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_algalon_the_observer.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_algalon_the_observer.cpp
index 1f90c584ab439e..a8f48f95e409f8 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_algalon_the_observer.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_algalon_the_observer.cpp
@@ -484,6 +484,7 @@ class boss_algalon_the_observer : public CreatureScript
 
             uint32 introDelay = 0;
             me->setActive(true);
+            me->SetFarVisible(true);
             me->SetInCombatWithZone();
             me->SetUnitFlag(UNIT_FLAG_NOT_SELECTABLE);
             me->SetImmuneToNPC(true);
diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_razorscale.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_razorscale.cpp
index 1ab35a6a11daba..745676de03d64b 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_razorscale.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_razorscale.cpp
@@ -175,6 +175,7 @@ class boss_razorscale : public CreatureScript
         {
             me->SetDisableGravity(true);
             me->setActive(true);
+            me->SetFarVisible(true);
             Reset();
         }
 
diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_thorim.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_thorim.cpp
index 1803f4dcc91651..b85c19216b1fdf 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_thorim.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_thorim.cpp
@@ -517,6 +517,7 @@ class boss_thorim : public CreatureScript
             if (m_pInstance && !_encounterFinished)
                 m_pInstance->SetData(TYPE_THORIM, IN_PROGRESS);
             me->setActive(true);
+            me->SetFarVisible(true);
             DisableThorim(true);
             me->CastSpell(me, SPELL_SHEATH_OF_LIGHTNING, true);
             //me->CastSpell(me, SPELL_TOUCH_OF_DOMINION, true);