I think you hit it on the nail. I've looked at the logs and there are a couple of hundred ones, but definitely not thousands, of 1-row queries. Also this issue has gone away with time, without me touching anything. That must be caching in action. I'll investigate further, add laziness and do a fresh start to see if this will improve things. This tip is very much appreciated! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3985510#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...