To add, the author only profiled within Resource Monitor, which was like the cause: WindowServer shouldn't have a massive increase of CPU, but a bug since Catal

To add, the author only profiled within Resource Monitor, which was like the cause: WindowServer shouldn't have a massive increase of CPU, but a bug since Catalina sometimes does cause it to do super inefficient WindowServer stuff: https://news.ycombinator.com/item?id=25401681 https://news.ycombinator.com/item?id=25401681