At least with the MyFacesGenericPortlet above one can use the JBossSerialization factory. 01:14:41,310 INFO [MyFacesGenericPortlet] Serialization provider : class org.apache.myfaces.JbossSerialFactory No idea, wheter it made any performance increase.. But maybe it's better than the DefaultSerialFactory. Just added <context-param> | <param-name>org.apache.myfaces.SERIAL_FACTORY</param-name> | <param-value>org.apache.myfaces.JbossSerialFactory</param-value> | </context-param> without the <listener> | <listener-class>org.apache.myfaces.webapp.StartupServletContextListener</listener-class> | </listener> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3980222#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...