My suspicion is that it has to do something with Metal being used instead of OpenGL for system apps in iOS 9 [1]. The result is severe framedrops when scrolling

My suspicion is that it has to do something with Metal being used instead of OpenGL for system apps in iOS 9 [1]. The result is severe framedrops when scrolling lists in apps and rendering overlays as on video. [1] http://www.apple.com/ios/whats-new/ http://www.apple.com/ios/whats-new/ The behaviour seen on linked videos have been the same since first Beta 1 in June 2015, but wasn't taken seriously in online discussions as "being a beta" and was thought it will be taken care of in the future.