I can strongly confirm this behavior from the player side.
In my case, mouse movement becomes choppy exactly when keyboard input is registered, while FPS remain stable and GPU/CPU usage looks normal.
The affected keys change every game launch, and after longer sessions the stutter can also affect mouse-only input until the game is restarted.
Multiple keyboards, mice, USB ports, polling rates, overlays, RGB software, clean drivers — all tested and ruled out.
The fact that workarounds like pre-pressing keys at launch or capping FPS only mask the issue strongly suggests a kernel-level input validation problem rather than hardware or configuration.
This is gameplay-blocking, especially in modes like Battle Royale where many inputs are constantly used.
