Fullscreen Optimizations Windows 11 ((top)) -

Introduced in Windows 10 and refined in Windows 11, is a feature designed to offer the performance of "Exclusive Fullscreen" mode with the convenience of "Borderless Windowed" mode.

This can cause several issues:

For , you should leave Fullscreen Optimizations enabled .

If you disable FSO but still want fast Alt-Tabbing, there is a third option: .

Many modern games offer this as an in-game setting. If you select "Borderless" or "Windowed Fullscreen" inside the game menu , the game effectively ignores Windows' FSO and runs exactly how it wants—usually providing a middle ground between performance and multitasking.

Some legacy DX9 and DX11 engines suffer minor mouse latency.

Required for Windows 11 to inject Auto HDR into DX11 and DX12 titles.