As you are using MDBs, you are opening one XA transaction for each message received, what means several round trips for each message received. I also realized what you are saying, and as a result of running your testcase, I talked to Tim Fox this morning and opened this jira with a feature request: https://jira.jboss.org/jira/browse/JBMESSAGING-1686 ATM if you don't use MDBs and batch your transactions would give you a much better performance. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4244206#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...