Carlo de Wolf [http://community.jboss.org/people/wolfc] commented on the document "AS 7 startup time showdown" To view all comments on this document, visit: http://community.jboss.org/docs/DOC-16971#comment-6910 -------------------------------------------------- I can shave a couple of ms off by having every jar stored instead of zipped. (The Inflater.inflateBytes takes some times.) Most time is spend in Class.defineClass1. I don't think we can do much about that except "-noverify". Another notable is XML parsing. It uses String.charAt a lot, which can be improved by rewriting woodstox to use CharSequence which you back with an implementation that has no offset (thus no checks). That gives you 20-40% char handling performance improvements. --------------------------------------------------