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by Kristine1975 3879 days ago
>also MacOS itself is reasonably GPU-heavy

OS X's window manager is optimized for fullscreen windows on top of everything else (including menu bar and the "Dock"): https://developer.apple.com/library/mac/documentation/Graphi...

I also found that even with a GPU-heavy fullscreen application, having another (smaller) window on top doesn't noticibly degrade rendering performance. It seems the window manager is doing some clever things there in regards to compositing.