Cougar-Time!

Are there Cocoa engine improvements in Mountain Lion? My machine seems to render all sorts of things more quickly (like html in emails, and Safari is noticeable). Generally a little usability tweak, with some UI elements also getting a little clean-up. Will report as I go, but initial impressions very good. Installation was a breeze, and although some things reported incompatibilities, I stupidly didn't click the "tell me more" button. Not 100% sure I like the close ties between machine and .mac account, but it was inevitable.