This is a very vague question. What exactly do you want to know? If you're asking whether or not the same functionality will run faster in a Java backed WebScript or a JavaScript controller webscript then I can't give a definitive answer. Whilst both approaches will go through quite a common code path (e.g. for matching the WebScript, initial set up, template rendering, etc the paths only diverge at the controller stage. I think it very much depends on what you're trying to do and the complexity of the controller, but for most cases I doubt there is much in it. The advantages of using a Java backed WebScript are more to do with having access to the entire Spring application context.
