The best place to discuss JBoss AS5 user questions is here http://www.jboss.com/index.html?module=bb&op=viewforum&f=287. Please create a new thread there and provide more details. Do you have some numbers which show where exactly the time is spent? Have you tried JBoss-4.2.3 GA? How does it behave? JBoss-5 is currently in CR so there might be some issues, but you will have to narrow down the performance issue to understand what exactly is going wrong.