Mobile performance has to do more with the expectations of multi-touch interaction for the user and less about the whole application simply being "slow". Very m

Mobile performance has to do more with the expectations of multi-touch interaction for the user and less about the whole application simply being "slow". Very marginal differences in performance can have massive effects on the usability of apps on a mobile devices. For example - imagine the lock screen slider didn't follow your finger as you swiped, but slightly lagged behind. Would you know initially that it was even swipe-able if that were the case?