It glitches, together with the keyboard. It’s like events start piling up as the UI loop locks up (for up to 1 sec.) then suddenly they rush through and the pointer wanders around and keystrokes fall through at a constant rate. Other times they’re barely lagging enough to feel it.

Awful, but I remember similar issues on Dell and an HP. It’s an issue with the device driver or some “value add” driver control software. :(