Sets DisableIdleTimeout = 1 under SYSTEM\CurrentControlSet\Control\GraphicsDrivers. The Windows Display Driver Model drops the GPU into low clocks the moment it sees a short gap between frames — a power-saving heuristic that backfires on desktops by introducing a 5-30 ms clock-ramp lag the next frame. With this set, the WDDM keeps the GPU at performance state until there's a genuinely long idle. Desktop / wall-power only — wrecks laptop battery. Reboot recommended.
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-hardware/drivers/display/wddm-power-management