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This is really interesting.
If I had to guess....
Slow fullscreen mode for games, particularly those using MiniGL, might suffer from a potential context switch inducing loop where the screen buffer flip is attempted.
For regular windowed, there is maybe only a lock screen and blit call into the window, there's no looping.
For fullscreen windowed, perhaps the blit call above is faster due to some short circuit, e.g not having to worry about clipping against layers and so forth (pure speculation).
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