The replication optimization stuff I mentioned in last week's team call are discussed at http://jira.jboss.com/jira/browse/EJBTHREE-1039 http://jira.jboss.com/jira/browse/JBAS-4629 http://jira.jboss.com/jira/browse/JBAS-4630 BTW, I haven't looked at the xpcalt stuff in great detail, but one thing I don't see is any SFSB holding a ref to a managed entity across replication or passivation/activation. There needs to be object identity maintained between any such entity and the entity stored in the XPC. I don't know if what you're working on will handle that well or not. That said, an independent lifecycle for XPCs certainly sounds good. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4078496#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...