Updates of apple and android
Every animation in 60 fps, so said at googles IO.
why isn't there anything comparable for iOS? Every iOS update slows down the iPad/iPhone a little bit, but I think Google is trying to do the opposite: e g project butter for old android devices, so they can run faster and smoother. I have the iPhone 4s, and I know it could run much faster if apple really wants to optimize it, because old iOS versions with jailbreak are running much faster.
Remember ios 7 first on iPhone 4? Absolutely not usable....now really slow compared to iOS 5 or iOS 6.
edit : apple can if they want. Mavericks on OS X was a huge improvement to my MacBook, and I think older macs running better now