This is an old )i7-9700k) desktop PC running Win10 22H2. No chance of (or desire to) upgrade to Win11.

Today it had some patches and needed a reboot, same as usual. However, the mouse is stuttery and laggy as hell now.

Task manager is showing typically low use of CPU/GPU/RAM/IO, nothing obvious there. However, it feels like something is hitting 100% CPU across all cores. If I move the mouse too quickly, it will stick, stutter, and then catch up. If I try to drag something too fast, it unselects it.

Something broke badly in this last update. Any suggestions?