Excuse me if I'm doing it wrong by opening a new thread, but it wasn't immediate to me in which one I should have asked about this issue. By the way, I'm posting because I have an issue with my iPhone 6 and I wanted to find out whether it's common or not. My iPhone 6 used to be super smooth with iOS 8.4 when I bought it. Since I installed iOS 9.1 (the official release, not a beta), most system animations (app switcher, search screen, control center and so on) became rather laggy. I do not believe it's an hardware issue, since my device runs intense graphic games such as Real Racing 3 without the smallest lag. I even try to restore iOS, but it didn't help. Any clue?