Sets SystemResponsiveness = 10 under Multimedia\SystemProfile (Windows default is 20). This value is the percentage of CPU that the Multimedia Class Scheduler guarantees to LOW-priority/background threads — lowering it from 20% to 10% lets foreground multimedia/game threads keep more of the CPU under load, tightening frame pacing. Important: Microsoft clamps any value below 10 back to 20, so the widely-shared 'set it to 0' is a no-op — 10 is the real minimum. Reboot (or an MMCSS restart) makes it live. Reversible; auto-snapshots the prior value.
MaxTweaks applies this tweak with one click and snapshots your original setting first, so you can revert it cleanly at any time. A System Restore point is offered before batch changes, and every tweak links to its official source.
Get MaxTweaksOfficial documentation: https://learn.microsoft.com/en-us/windows/win32/procthread/multimedia-class-scheduler-service