"Disable full-screen optimization" is a compatibility setting in Windows 10 and 11. When you run a game or app in exclusive full-screen mode, Windows 10/11 by default actually runs it in a hybrid "borderless windowed" mode via a feature called the . This is meant to make alt-tabbing faster and overlays (like Xbox Game Bar) smoother.

Despite its intent, the feature can sometimes interfere with how a game’s engine renders frames. Disabling it forces the game into a "true" exclusive fullscreen mode. Common reasons to disable it include:

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