iOS. But, also, this isn't the first time this has happened in MacOS either: https://arstechnica.com/gadgets/2020/11/macos-big-sur-launch-appears-to-cause-temp

iOS. But, also, this isn't the first time this has happened in MacOS either: https://arstechnica.com/gadgets/2020/11/macos-big-sur-launch-appears-to-cause-temporary-slowdown-in-even-non-big-sur-macs/ https://arstechnica.com/gadgets/2020/11/macos-big-sur-launch...