Hi Clebert, Thanks for the info, however I forgot to mention that each subscriber will have a selector to only pull down messages that its interested in. I know that selectors have a more substantial performance impact than subs with no selectors. Thanks for the tip on the openFiles. I understand that all of this is based on app design and server tuning I was just concerned that the designers are treating the JMS subscribers as a kind of lightweight thread (for lack of a better description). I'd rather move them into using a lot less JMS resources and having more application threads to process the messages. thanks for your help Noel View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4193643#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...