Recommended Reading : Reducing Overhead with Netty 4

If you are using Netty 3, you may be interested in what Twitter has done to improve Java GC overhead in Netty 4.   Netty is a new generation, high performance server that leverages the Jav NIO (New I/O APIs).  Twitter has been working on improving Netty with new buffer pools and removing of event objects.  According to their tests they were able to get five times less frequent GC pauses and five times less garbage production.