I now have a few thread dumps, but I'm not quite sure what to look for. I always have about 115 threads out of which about 33-38 are RUNNABLE. 32-34 are in state TIMED_WAITING, 32-34 are WAITING. Correct me if I'm wrong, but I assume the thread or the threads that are burning CPU must be in state RUNNABLE and I guess, I will need to take take a look at a number of snapshots to actually catch the thread while it is executing. In all of my dumps the GC Daemon is in state TIMED_WAITING (on object monitor), even though the machine is really busy. Does that mean it's not the GC Daemon? What else should I look for? I wasn't able to turn on GC logging on the production server, so I have no results from that side (yet). Thank you for more help. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4177196#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...