The slowdown is due to the classloader inspecting every class whether it matches bindings. This can be controlled by using the Include/Exclude options. Can you try your example with non-isolated classloading? Also, try the injboss tutorial and see if you can reproduce the problem there with scoping turned on. If you can I will take a look. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4037550#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...