javascript event management, handling global vs lots of listeners
===

I've been developing a framework for webapps based upon and MVC style methodology.

It's more of a general question to the JS gurus amongst you:
if you have lots of views each with various event listeners, does this slow the overall responsiveness down? I'm toying with the idea of creating a global event manager which drills down to active views/objects based on mouse position & focus then calls methods instead of creating lots of listeners all over the place for each and every view. 

Would this improve the overall responsiveness of the app or is this largely pointless?

It's hard to create unit tests to check and I'm hoping for some insight from others. 