The best approach would be to treat "High Performance" as a system-controlled attribute like "Can Read Location Data"; the app can make a request for a performa

The best approach would be to treat "High Performance" as a system-controlled attribute like "Can Read Location Data"; the app can make a request for a performance profile it's designed against, the user gets final say-so, the OS records the user's decision and re-uses it for future launches. This gives best of both worlds; users who need performance pick it, users who don't need/don't understand get to be kept safe by Apple's scheduler. Apps get back the state, so they can render a different icon or something to indicate "Hey we'll do our best but your hardware may not max out because scheduling wasn't built for this task"