Sets DwmInputUsesIoCompletionPort = 1 under SOFTWARE\Microsoft\Windows\Dwm. Switches the desktop compositor's input pump from a message-queue model to a kernel I/O completion port. The IOCP path delivers mouse + keyboard wake-ups with less context switching and lower wakeup-to-handler latency — a real reduction in the cursor-to-frame delay on desktop and in borderless games. Safe and reversible.
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/api/ioapiset/nf-ioapiset-createiocompletionport