I know that there are definitely things to improve in XB and I'd also like to see whether it'd be worth to spend time on it. That's why I want to at least have a picture of what's going on with the current impl. I don't think there have been an effort to get it. You can't avoid pure XML parsing, right? The rest is what can be optimized. So, it appears that total unmarshalling time (including all the XML files) during AS start-up consists of ~33% of pure XML parsing (xerces) + ~67% of the XB code on top of it. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4255588#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...