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).<
I'm not sure any of those frameworks you mention will seriously hinder scalability.
It all depends on the implementation.
I would concentrate getting your web app to work well first, and then worry about scalability when it becomes an issue. In other words "let's cross that bridge when we come to it".