My biggest gripe is the flashlight delay - swipe up for control center, tap flashlight, and the actual light takes easily a third of a second to turn on. I suspect that's also waiting for the stupid animation to complete.
Honestly I feel like the people in charge of iOS have stopped using the devices personally. I have no other explanation for so much annoying crap slipping through (ok, other than some idiot exec being in love with the animations, and shutting down any attempt to correct this behaviour, like what happened with Forstall's obsession with skeuomorphism).
The flashlight behaviour is odd, I just tried it and I got the same delay the first time I turned it on, but no delay after turning it on multiple times. It's almost as if the code was swapped out to a slow disk and you have to wait for it to be swapped back in before the first use. There's still no good reason why it should take such a noticeable time, though.
There's no swapping on iOS. The delay is probably caused by iOS lazily waking up some hardware. The same happens when you use haptic feedbacks:
>Calling the generator’s prepare() method puts the Taptic Engine in a prepared state. To preserve power, the Taptic Engine stays in this state for only a short period of time (on the order of seconds), or until you next trigger feedback.
Honestly I feel like the people in charge of iOS have stopped using the devices personally. I have no other explanation for so much annoying crap slipping through (ok, other than some idiot exec being in love with the animations, and shutting down any attempt to correct this behaviour, like what happened with Forstall's obsession with skeuomorphism).