iOS has been getting more laggier from iOS7 to iOS9, there are countless threads about it. There has even been a lawsuit due to Apple making iPhone 4s unusably slow when iOS9 first came out. Certainly Apple's latest iOS isn't winning responsiveness/stutter-free awards to say the least.
The rubber band scrolling is actually not a good feature, it looks nice initially but in truth it has a considerable downside: suppose you know you want to tap something and the end of a list fast, you scroll fast and tap it, what happens? Your input is not registered, because the rubber band animation kicks in, blocking your input. The user has to wait until rubber band animation is done, and then tap the desired item.
On Android it's actually better, you scroll to the end and it gives you a visual cue, but there is no animation that blocks input nor any moving target, so you can tap immediately.
I'm surprised you cite iTunes as a positive factor, iTunes has a reputation of being too bloated. As recent as a last friday there was some news about Apple trying to fix it a bit, and just look at the general consensus, there are very strong negative opinions on it:
https://forums.macrumors.com/thread...with-new-sidebar-improved-navigation.1971464/