I just remembered looking into this when JBSER was being originally developed. RMI is strictly tight integrated with ObjectInputStream. It will use a lot of java.rmi.MarshalledObjects (or javax.. I don't remember now). Because of that I had an effect such has ObjectInputStream Marshalling JBossObjectInputStream... and then objectINputStream, what used a lot of memory and caused some performance issues. I suggest you taking a look on JBoss-Remoting2. It has a more light weight approach to remote calls, it supports JBSER, and it will have another cool Marshalling mechanism that David Lloyd is working on. if you have access to IRC, I hang a lot on #jboss-remoting, IRC@freenode. David Lloyd would also be a good person to be talking to. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4177240#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...