Solve long standing issue of creating too many TCP packets. This fix works very effectively.

proxy/src/main/java/net/md_5/bungee/BungeeCord.java

@@ -181,7 +181,7 @@ public class BungeeCord extends ProxyServer
     public static void main(String[] args) throws Exception
     {
         Calendar deadline = Calendar.getInstance();
-        deadline.set( 2013, 7, 1 ); // year, month, date
+        deadline.set( 2013, 7, 16 ); // year, month, date
         if ( Calendar.getInstance().after( deadline ) )
         {
             System.err.println( "*** Warning, this build is outdated ***" );

proxy/src/main/java/net/md_5/bungee/netty/ChannelWrapper.java

@@ -2,6 +2,7 @@ package net.md_5.bungee.netty;
 
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.MessageList;
 import lombok.Getter;
 
 public class ChannelWrapper
@@ -10,17 +11,35 @@ public class ChannelWrapper
     private final Channel ch;
     @Getter
     private volatile boolean closed;
+    private final MessageList<Object> queue = MessageList.newInstance();
+    private volatile boolean flushNow = true;
 
     public ChannelWrapper(ChannelHandlerContext ctx)
     {
         this.ch = ctx.channel();
     }
 
+    public synchronized void flushNow(boolean flush)
+    {
+        if ( !flushNow && flush )
+        {
+            ch.write( queue.copy() );
+            queue.clear();
+        }
+        this.flushNow = flush;
+    }
+
     public synchronized void write(Object packet)
     {
         if ( !closed )
+        {
+            if ( flushNow )
             {
                 ch.write( packet );
+            } else
+            {
+                queue.add( packet );
+            }
         }
     }
 
@@ -29,6 +48,7 @@ public class ChannelWrapper
         if ( !closed )
         {
             closed = true;
+            ch.write( queue );
             ch.close();
         }
     }

proxy/src/main/java/net/md_5/bungee/netty/HandlerBoss.java

@@ -61,6 +61,7 @@ public class HandlerBoss extends ChannelInboundHandlerAdapter
     @Override
     public void messageReceived(ChannelHandlerContext ctx, MessageList<Object> msgs) throws Exception
     {
+        channel.flushNow( false );
         for ( Object msg : msgs )
         {
             if ( handler != null && ctx.channel().isActive() )
@@ -85,6 +86,7 @@ public class HandlerBoss extends ChannelInboundHandlerAdapter
                 }
             }
         }
+        channel.flushNow( true );
     }
 
     @Override