I'm on ML now, and it does run smoother...the first time I booted up to it things were kinda janky, but after a restart everything runs a bit better and I haven't had any performance issues since. I'm not stoked on the whole OSX becoming iOS thing, I get it because it's simplified and makes sense to the masses so it's easier to use (one of the reasons iphones and ipads are the most used smartphones/tabets out there right now...my grandparents have iphones but can't use their computer to do much at all), but it does bother me. Personally, I just don't use launchpad...that's really the only thing that's making it like iOS. I like that I can seamlessly go from my computer to my phone now, like if I make a change to my notes or calendar or I'm mid text/im it's already on my phone when I need to leave for somewhere.