>> I do think your logic holds for many combinations of users and infrequently-used applications. Do you consider the Facebook app infrequently used? Or virtua

>> I do think your logic holds for many combinations of users and infrequently-used applications. Do you consider the Facebook app infrequently used? Or virtually every other app in the iOS app store that has a UIControl embedded inside of a scroll view such that highlighting of elements is intentionally delayed? There is certainly a few frames worth of work that can be done while no interruptable animations are occurring and while no interaction is occurring. If you don't believe me, then I suggest you do what I often do: use a very high speed camera and examine your casual usage of an app. You'll find that you are much slower than you think you are.