That is because you didn't have any jgroups library in your classpath, it has nothing to do with performance View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4084867#4084867 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4084867