If you have a profiler you can attach it to the jbossas to see what it is doing. Or you could take multiple jvm thread dumps and see what the threads are doing; that will sometime point out code hot spots. Also, have you eliminated garbage collection as being the issue? Have you gathered gc data (using -verbose_gc is usually sufficient) and analyzed it? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4136828#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...