iOS 10 is not promising better performance like iOS 9 did. So far, everything we're seeing in iOS 10 is what they advertised it to be.
iOS 9 specifically stated that Metal would bring smoother scrolling and app performance, but that's not what we got. We got lags and frame drops everywhere. Then, instead of getting better, it got worse in some areas and better in some areas, but it still wasn't up to par with iOS 8.
Also, the addition of input lag really brought it down a few notches from iOS 8. It makes it hard to do anything with any sort of speed, if you have to wait for the animation to be completely settled down before making another tap. I'm not talking about tapping mid-animation, but sometimes it will look like the animation has finished, but it really hasn't and it will ignore your first tap. iOS 10 still does this in a lot of areas, but at least the animations are faster and smoother now.