Does anyone use frameworks? I'm a purist and like to do things myself because it seems like the frameworks come loaded with way too much, especially CSS that you may not even use.

But I know some people use it, and maybe I could be building better websites if I started from a framework instead of from scratch every time. It seems contradictory page speed because everything I've read about page speed suggests linking to fewer files in the head section, yet the frameworks always come with a billion css files. so what's up with that?

Also, it seems like Twitter bootstrap also talks about something called .less, what do I use that for?