So, recently I have been interested in the smoothest custom UI that is available. No, I am not talking about ROMs or anything to do with rooting. I am speaking of TouchWiz, Optimus UI, Color OS, ect. Which one do you think is the fastest, most responsive, and smoothest out of all of them? I can certainly say, from watching videos and from my own personal experience that the Optimus UI is NOT the best. I've heard many bad things about Samsung's custom UI as well, but what do you think? I own a Nexus 7 and it somewhat isn't so responsive, but it is a year old.