Well, a jbossws call by reference probably does not make sense, since handlers require the XML view of the payload. If object to XML serialization takes place anyway (which by nature is expensive) it remains to be shown what can be gained by a local remoting invocation. Before we invest in an optimization at the transport level in VM we should investigate for what kind of payload this would make sense first. In case there are no handlers involved an in VM optimization would theoretically be possible, but since web services is about document based integration of heterogeneous IT systems and not RPC you probably want to use something else (instead of WS) when you need RPC functionality. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4118161#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...