What are your config values for Ajax4Jsf's 'forceparse' in web.xml and Seam 'debug' in components.xml: <core:init debug="false" >? I believe that by default, every request is routed through a Tidy filter, even for non-Ajax pages. forceparse = false will ensure that only Ajax requests go through the tidy process. Make sure debug = false as Seam will reload pages.xml and other resources on each page request which on my machine adds 50ms or so to each request. Between the struts and seam scenarios I assume you are using the identical JVM versions/parameters? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4057377#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...