iPhone 4S : iOS vs iOS Final Release Build 13G34

The adoption rate for iOS 9 is still very impressive. According to it is currently at %, and there are still % of users still on iOS 8,and % on iOS 7 or older. Many people are holding back from upgrading as they fear that their device will get slow, and with good reason. Moving from iOS 6 to 7, and iOS 7-8 surely gave the older devices a drop in performance. But has the newly release iOS done anything to bring performance up when compared to iOS and iOS ? Conc