In Android, you can have a translucent popups from App#1 appear on top of any sort of screen of App#2. You can't have this on iOS. At all.
On the other hand, animations and scrolling are blazing fast on iOS without any need for superior hardware.
I honestly believe that this alone explains the "lacking" in performance that Android suffers from: it targets super high-end multi-core devices, with JIT compilers and optimizers that don't exist yet, in order to allow functionalities that are unclear to everyone of us.
Shameless plug: I made an app (1) that illustrates what iOS will never be able to do. The question is, will anyone ever need that sort of app on their phone?
(1) https://market.android.com/details?id=com.fairyteller.linkpr...