Not necessarily just apps, how about IOS: The worst for me is the delay in rendering the bar that occupies the top of the screen when navigation is in use or wh

Not necessarily just apps, how about IOS: The worst for me is the delay in rendering the bar that occupies the top of the screen when navigation is in use or when tethering is in use. I often look at the screen, then tap, but in between those events the bar appears and receives my click. It's nearly always inconvenient to get the phone back to the intended screen. It seems that the delayed appearance of the bar is an intentional UI 'feature' because in all cases the state is known prior to waking the phone.