I ran my code through a profiler and put the meaningful results on my website (http://keyspace.org/callTree.html). The results are from 50 invocations of my JSR-109 Web Service client. The root node ($Proxy55.append) is the method I am invoking off my endpoint. It doesn't appear now that the unmarshalling is particularly expensive. Rather, it appears that its the marshalling that is taking up most of the time, especially building the DOM. It seems to be that this should be much much faster considering that the message that it is sending is only around 900 bytes. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3968695#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...