Mouse Lagging or Stuttering? How to Fix It
Quick answer: A lagging or stuttering mouse usually comes from a poor tracking surface, a flaky USB port or wireless interference, low batteries, or a driver issue. Change the surface and port first, then update drivers.
See the tracking for yourself: open the mouse test and move the cursor.
Surface and sensor
Use an opaque mousepad rather than glass or a glossy desk, and wipe the sensor lens on the underside clean. Both make a big difference to tracking.
Connection
Plug a wired mouse into a different port, ideally on the back of a desktop. For wireless, fit fresh batteries, move the receiver closer or onto an extension, and keep it away from USB 3.0 ports, which cause interference.
Software
Update the mouse driver, close heavy background tasks that cause stutter, and consider turning off Enhance Pointer Precision for consistent movement. If the cursor jumps rather than lags, see a mouse cursor jumping around.
Confirm the fix
Re-run the mouse test — the pointer should track smoothly with no stutter or delay.