The database is the same The host is the same The data is the same The database driver and JPA provider are the same The entities and resulting SQL is the same In a standalone tomcat with simlar JVM opts a certain "from Foo" query takes 1,3s but on JBoss it takes closer to 3s. Must check with the performance forum if there are no theories here... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4083788#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...