Game priority in the multimedia scheduler

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The Multimedia Class Scheduler (MMCSS) reserves less CPU time for the background and raises the priority of the Games task.

Expected effect

The effect depends on the game: noticeable mainly in games that register with MMCSS. It is often within measurement error.

Possible side effects

Background programs (recording, streaming) may get less CPU time during the game.

What exactly changes

Registry key	Value	Type	New value
`HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile`	`SystemResponsiveness`	DWord	`10`
`HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile\Tasks\Games`	`GPU Priority`	DWord	`8`
`HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile\Tasks\Games`	`Priority`	DWord	`6`
`HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile\Tasks\Games`	`Scheduling Category`	String	`High`

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.

← Hardware-accelerated GPU scheduling Turn off fullscreen optimizations →

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