Originally Posted by VexVishnu
I see this quite often but for me it's the exact opposite. I get another 12 (on avg) FPS playing in windowed than I would playing in fullscreen. :/
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If you're using opengl (and if you're on OSX, you are), it has the same rendering speed for windowed apps, as it does for full screen apps, and since the windowed app theoretically can be a smaller size/resolution, it can be faster, depending on how big the window is, among other things.
DirectX is the only one that is actually faster fullscreen than windowed, given equal resolution of each.
Of course, directX is also faster in full screen than OpenGL is, on the same hardware, but they're approximately the same speeds if you run windowed.