I notice, Safari on mountain lion occupying much space and also bit slower than the one on Lion X. I think I need to go and get more info on upgraded safari to see have added more specifically. some times takes time to launch web, may be it is doing additional things. Also I do not like much longer tabs on it, but it is my personal opinion though. Overall I like ML, with its new features, specially Air play. Is any one notice similar or close to what I see ??