Has anyone tried xmlbeans from weblogic. I gave it a try and found that it unmarshalled in about 2/3's the time that JAXB took, but used about 50% more memory. I have had a lot of success using JAXB, but I wanted to check out a few other options for performance.
Also has anyone tried using JIBX?
http://www-106.ibm.com/developerworks/library/x-databdopt2/index.html