diff --git a/.idea/encodings.xml b/.idea/encodings.xml
index b26911b..fade66b 100644
--- a/.idea/encodings.xml
+++ b/.idea/encodings.xml
@@ -2,5 +2,6 @@
 <project version="4">
   <component name="Encoding">
     <file url="file://$PROJECT_DIR$" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 3a36332..fb55160 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
   <component name="MavenProjectsManager">
     <option name="originalFiles">
       <list>
diff --git a/README.md b/README.md
index 2da5c31..edbd8c6 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ kcp for java . base on netty .
 
 kcp是一种独立于底层通信协议的重传算法，jkcp直接构建于udp之上
 并提供方便的编程接口，只需要继承相关的类即可；用户不用关心udp
-和kcp的使用细节就能轻松驾驭moba类等需要高速传输环境的应用开发
+和kcp的使用细节就能轻松驾驭视频、moba类等需要高速传输环境的应用开发
 
 ##坐标
 
@@ -12,7 +12,7 @@ kcp是一种独立于底层通信协议的重传算法，jkcp直接构建于udp
   <dependency>
       <groupId>org.beykery</groupId>
       <artifactId>jkcp</artifactId>
-      <version>1.2.9</version>
+      <version>1.3.0</version>
   </dependency>
 ```
 
diff --git a/pom.xml b/pom.xml
index ac0ca5d..22ccf73 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.beykery</groupId>
     <artifactId>jkcp</artifactId>
-    <version>1.2.9</version>
+    <version>1.3.0</version>
     <packaging>jar</packaging>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -113,7 +113,7 @@
         <dependency>
             <groupId>io.netty</groupId>
             <artifactId>netty-all</artifactId>
-            <version>4.1.45.Final</version>
+            <version>4.1.49.Final</version>
         </dependency>
 
         <!--
diff --git a/src/main/java/org/beykery/jkcp/Kcp.java b/src/main/java/org/beykery/jkcp/Kcp.java
index 7f9be15..5ca2aab 100644
--- a/src/main/java/org/beykery/jkcp/Kcp.java
+++ b/src/main/java/org/beykery/jkcp/Kcp.java
@@ -11,10 +11,10 @@
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.PooledByteBufAllocator;
 
-import java.util.LinkedList;
+import java.util.ArrayDeque;
+import java.util.ArrayList;
 
 /**
- *
  * @author beykery
  */
 public class Kcp {
@@ -70,11 +70,11 @@ public class Kcp {
     private int probe_wait;
     private final int dead_link;
     private int incr;
-    private final LinkedList<Segment> snd_queue = new LinkedList<>();
-    private final LinkedList<Segment> rcv_queue = new LinkedList<>();
-    private final LinkedList<Segment> snd_buf = new LinkedList<>();
-    private final LinkedList<Segment> rcv_buf = new LinkedList<>();
-    private final LinkedList<Integer> acklist = new LinkedList<>();
+    private final ArrayDeque<Segment> snd_queue = new ArrayDeque<>();
+    private final ArrayDeque<Segment> rcv_queue = new ArrayDeque<>();
+    private final ArrayList<Segment> snd_buf = new ArrayList<>();
+    private final ArrayList<Segment> rcv_buf = new ArrayList<>();
+    private final ArrayList<Integer> acklist = new ArrayList<>();
     private ByteBuf buffer;
     private int fastresend;
     private int nocwnd;
@@ -244,7 +244,7 @@ public int receive(ByteBuf buffer) {
         }
         if (c > 0) {
             for (int i = 0; i < c; i++) {
-                rcv_buf.removeFirst();
+                rcv_buf.remove(0);
             }
         }
         // fast recover
@@ -271,7 +271,7 @@ public int send(ByteBuf buffer) {
             Segment seg = snd_queue.getLast();
             if (seg.data != null && seg.data.readableBytes() < mss) {
                 int capacity = mss - seg.data.readableBytes();
-                int extend = (buffer.readableBytes() < capacity) ? buffer.readableBytes() : capacity;
+                int extend = Math.min(buffer.readableBytes(), capacity);
                 seg.data.writeBytes(buffer, extend);
                 if (buffer.readableBytes() == 0) {
                     return 0;
@@ -292,7 +292,7 @@ public int send(ByteBuf buffer) {
         }
         //fragment
         for (int i = 0; i < count; i++) {
-            int size = buffer.readableBytes() > mss ? mss : buffer.readableBytes();
+            int size = Math.min(buffer.readableBytes(), mss);
             Segment seg = new Segment(size);
             seg.data.writeBytes(buffer, size);
             seg.frg = this.stream ? 0 : count - i - 1;
@@ -328,7 +328,7 @@ private void update_ack(int rtt) {
 
     private void shrink_buf() {
         if (snd_buf.size() > 0) {
-            snd_una = snd_buf.getFirst().sn;
+            snd_una = snd_buf.get(0).sn;
         } else {
             snd_una = snd_nxt;
         }
@@ -362,7 +362,7 @@ private void parse_una(int una) {
         }
         if (c > 0) {
             for (int i = 0; i < c; i++) {
-                Segment seg = snd_buf.removeFirst();
+                Segment seg = snd_buf.remove(0);
                 seg.data.release(seg.data.refCnt());
             }
         }
@@ -413,11 +413,7 @@ private void parse_data(Segment newseg) {
             }
         }
         if (!repeat) {
-            if (temp == -1) {
-                rcv_buf.addFirst(newseg);
-            } else {
-                rcv_buf.add(temp + 1, newseg);
-            }
+            rcv_buf.add(temp + 1, newseg);
         } else {
             newseg.release();
         }
@@ -434,13 +430,12 @@ private void parse_data(Segment newseg) {
         }
         if (0 < c) {
             for (int i = 0; i < c; i++) {
-                rcv_buf.removeFirst();
+                rcv_buf.remove(0);
             }
         }
     }
 
     /**
-     *
      * when you received a low level packet (eg. UDP packet), call it
      *
      * @param data