As a quick guess, check your memory consumption. I would guess that your system is actually constantly collecting garbage. If this is the case, check your EJB3 caching setting. The default configuration uses a HasMap implementation which is not for production use (according to the Hibernate docs) as it does release much (or anything) from the cache. This should be replaced by a JBossCache instance. Hope this helps you, Joachim View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3973053#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...