I have combined the codec and packet classes, so now the packets know how to encode and decode themselves. This has simplified the code a fair bit and reduced the number of lookups. I've also done various other tweaks/optimisations along the way (I've lost track now). The good news is.. we're getting there. Using MINA transport and client and server on same box, I can send over 40K 250 byte messages (non persistent). This is pretty good. Lots more optimisations to do though.... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4149754#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...