With that last factor in mind, it will be interesting to see whether High Power Mode gets enabled on the MacBook Air, which since its switch to Apple Silicon no longer needs a fan at all. That should mean better performance across the board, at the expense of battery life and fan noise. If High Power Mode is indeed a continuation of Pro Mode, we would expect a similar outcome. For instance, one line mentioned “Apps may run faster, but battery life may decrease and fan noise may increase.” There was also a mention of “Fan speed limit overridden.” That’s because when it was discovered nestled inside MacOS Catalina 10.15.3 code, Pro Mode was accompanied by text explaining its expected effects.
