Turn off fullscreen optimizations

Optional

Fullscreen games run in true exclusive mode instead of optimized windowed mode.

Expected effect

Reduces latency in some older DirectX 9–11 games. Newer games usually show no effect.

Possible side effects

Slower Alt+Tab; overlays and HDR may not work in some games.

What exactly changes

Registry key	Value	Type	New value
`HKCU\System\GameConfigStore`	`GameDVR_FSEBehaviorMode`	DWord	`2`
`HKCU\System\GameConfigStore`	`GameDVR_HonorUserFSEBehaviorMode`	DWord	`1`
`HKCU\System\GameConfigStore`	`GameDVR_DXGIHonorFSEWindowsCompatible`	DWord	`1`

How to undo it

Before a change NyxBoost saves the previous values; "Revert" brings them back and removes those that did not exist before.

In NyxBoost: Recovery → “Revert” next to this setting's entry.
Without the program: open the Registry Editor (regedit), go to the key from the table and put back the previous value — NyxBoost records it in its change history.

How NyxBoost checks the result

After applying, NyxBoost reads the values again and compares them with the expected ones. To see the real effect on your PC, use FPS Lab: it measures the same game before and after.

← Game priority in the multimedia scheduler

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