Fullscreen Optimization is a Windows feature introduced with Windows 10. It changes how games and applications behave when running in fullscreen mode.

It sounds like you may have come across a post discussing how disabling "Fullscreen Optimizations" can fix stuttering, lag, or alt-tab crashes in PC games. This is a popular "tech tip" in gaming communities because Windows 10 and 11 handle fullscreen applications differently than older versions of Windows.

Right-click the (not always the desktop shortcut) and select Properties . Navigate to the Compatibility tab. Check the box labeled Disable fullscreen optimizations . Click Apply and then OK .

Disabling this feature reverts the game to , often solving these issues.

Microsoft introduced this feature to make PC gaming feel more like console gaming. It allows games running in "Fullscreen" to actually run in a specialized "Borderless Windowed" mode behind the scenes.

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