Sets PlatformSupportMiracast = 0 — keeping the GPU scheduler from yielding the GPU to Miracast/wireless-display work that almost no desktop user actually uses. Eliminates a small but persistent scheduler context-switch overhead that the WDDM polls for. Safe on any system that doesn't actively cast its display to a TV; can be reverted instantly. 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-miracast-display-codec-architecture