I\'ve been arguing with some friends on the university, and we can\'t get to a point to which is the framework with more scalability for web applications (and still very fast).<
You can also take a look at "What’s faster? PHP vs ASP vs JSP vs CGI etc"
I think Java/Java EE is the only "framework" designed from scratch to develop distributed/clustered applications and that encourages good practices to achieve it from specifications (EJB, JTA...).
But as usual, it depends. This kind of questions often tend to flame wars :)