Some portion of optimizations:

* Clear outgoing packet queue after player disconnect
* Disable sleep between chunk saving
* Put 2x4096 bytes instead 2048x4 bytes for region file aligment
* Using map to search player by name instead iterating over all players
* Some tweaks for decorations (item frames, maps)

patches/net/minecraft/world/storage/ThreadedFileIOBase.java.patch

@@ -0,0 +1,19 @@
+--- ../src-base/minecraft/net/minecraft/world/storage/ThreadedFileIOBase.java
++++ ../src-work/minecraft/net/minecraft/world/storage/ThreadedFileIOBase.java
+@@ -39,14 +39,14 @@
+                 ++this.savedIOCounter;
+             }
+ 
+-            try
++            /*try // KCauldron start
+             {
+                 Thread.sleep(this.isThreadWaiting ? 0L : 10L);
+             }
+             catch (InterruptedException interruptedexception1)
+             {
+                 interruptedexception1.printStackTrace();
+-            }
++            }*/ // KCauldron end
+         }
+ 
+         if (this.threadedIOQueue.isEmpty())