diff --git a/addons/GDTask/GDTask.Delay.cs b/addons/GDTask/GDTask.Delay.cs
index f7de42f..74eb6ad 100644
--- a/addons/GDTask/GDTask.Delay.cs
+++ b/addons/GDTask/GDTask.Delay.cs
@@ -253,7 +253,8 @@ static NextFramePromise()
                 TaskPool.RegisterSizeGetter(typeof(NextFramePromise), () => pool.Size);
             }
 
-            int frameCount;
+            bool isMainThread;
+            ulong frameCount;
             CancellationToken cancellationToken;
             GDTaskCompletionSourceCore<AsyncUnit> core;
 
@@ -273,7 +274,9 @@ public static IGDTaskSource Create(PlayerLoopTiming timing, CancellationToken ca
                     result = new NextFramePromise();
                 }
 
-                result.frameCount = GDTaskPlayerLoopAutoload.IsMainThread ? Engine.GetFramesDrawn() : -1;
+                result.isMainThread = GDTaskPlayerLoopAutoload.IsMainThread;
+                if (result.isMainThread)
+                    result.frameCount = Engine.GetProcessFrames();
                 result.cancellationToken = cancellationToken;
 
                 TaskTracker.TrackActiveTask(result, 3);
@@ -319,7 +322,7 @@ public bool MoveNext()
                     return false;
                 }
 
-                if (frameCount == Engine.GetFramesDrawn())
+                if (isMainThread && frameCount == Engine.GetProcessFrames())
                 {
                     return true;
                 }
@@ -348,7 +351,8 @@ static DelayFramePromise()
                 TaskPool.RegisterSizeGetter(typeof(DelayFramePromise), () => pool.Size);
             }
 
-            int initialFrame;
+            bool isMainThread;
+            ulong initialFrame;
             int delayFrameCount;
             CancellationToken cancellationToken;
 
@@ -373,7 +377,9 @@ public static IGDTaskSource Create(int delayFrameCount, PlayerLoopTiming timing,
 
                 result.delayFrameCount = delayFrameCount;
                 result.cancellationToken = cancellationToken;
-                result.initialFrame = GDTaskPlayerLoopAutoload.IsMainThread ? Engine.GetFramesDrawn() : -1;
+                result.isMainThread = GDTaskPlayerLoopAutoload.IsMainThread;
+                if (result.isMainThread)
+                    result.initialFrame = Engine.GetProcessFrames();
 
                 TaskTracker.TrackActiveTask(result, 3);
 
@@ -427,7 +433,7 @@ public bool MoveNext()
                     }
 
                     // skip in initial frame.
-                    if (initialFrame == Engine.GetFramesDrawn())
+                    if (isMainThread && initialFrame == Engine.GetProcessFrames())
                     {
 #if DEBUG
                         // force use Realtime.
@@ -476,7 +482,8 @@ static DelayPromise()
                 TaskPool.RegisterSizeGetter(typeof(DelayPromise), () => pool.Size);
             }
 
-            int initialFrame;
+            bool isMainThread;
+            ulong initialFrame;
             double delayTimeSpan;
             double elapsed;
             CancellationToken cancellationToken;
@@ -502,7 +509,9 @@ public static IGDTaskSource Create(TimeSpan delayTimeSpan, PlayerLoopTiming timi
                 result.elapsed = 0.0f;
                 result.delayTimeSpan = (float)delayTimeSpan.TotalSeconds;
                 result.cancellationToken = cancellationToken;
-                result.initialFrame = GDTaskPlayerLoopAutoload.IsMainThread ? Engine.GetFramesDrawn() : -1;
+                result.isMainThread = GDTaskPlayerLoopAutoload.IsMainThread;
+                if (result.isMainThread)
+                    result.initialFrame = Engine.GetProcessFrames();
 
                 TaskTracker.TrackActiveTask(result, 3);
 
@@ -549,7 +558,7 @@ public bool MoveNext()
 
                 if (elapsed == 0.0f)
                 {
-                    if (initialFrame == Engine.GetFramesDrawn())
+                    if (isMainThread && initialFrame == Engine.GetProcessFrames())
                     {
                         return true;
                     }
diff --git a/addons/GDTask/PlayerLoopTimer.cs b/addons/GDTask/PlayerLoopTimer.cs
index e91a424..aada6bc 100644
--- a/addons/GDTask/PlayerLoopTimer.cs
+++ b/addons/GDTask/PlayerLoopTimer.cs
@@ -142,7 +142,8 @@ bool IPlayerLoopItem.MoveNext()
 
     sealed class DeltaTimePlayerLoopTimer : PlayerLoopTimer
     {
-        int initialFrame;
+        bool isMainThread;
+        ulong initialFrame;
         double elapsed;
         double interval;
 
@@ -156,7 +157,7 @@ protected override bool MoveNextCore()
         {
             if (elapsed == 0.0)
             {
-                if (initialFrame == Engine.GetFramesDrawn())
+                if (isMainThread && initialFrame == Engine.GetProcessFrames())
                 {
                     return true;
                 }
@@ -174,7 +175,9 @@ protected override bool MoveNextCore()
         protected override void ResetCore(TimeSpan? interval)
         {
             this.elapsed = 0.0;
-            this.initialFrame = GDTaskPlayerLoopAutoload.IsMainThread ? Engine.GetFramesDrawn() : -1;
+            this.isMainThread = GDTaskPlayerLoopAutoload.IsMainThread;
+            if (this.isMainThread)
+                this.initialFrame = Engine.GetProcessFrames();
             if (interval != null)
             {
                 this.interval = (float)interval.Value.TotalSeconds;