Hi, I have found out it is because I have "show_sql" set to true in my hibernate.cfg.xml file. After I set it to false, my application run faster. <property name="show_sql">true</property> Just that I don't understand, I also have "show_sql" set to true when deploy to Apache Tomcat, and the performance is still fast. Not sure why when deploy to Jboss AS, it seems like I have to disable the show_sql in order to boost up the performance. Any comment will be very much appreciated. Thank you. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3974409#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...