Yeah I did a search and found another person with the same issue.
No solution though.
And what’s bonkers is that when it’s happening there’s no way of knowing that it’s the trackpad causing this lag. So you still don’t understand what’s causing it and all I could search for was the symptoms… sluggish, slow, cubase editing note pitches with arrow keys etc. Didn’t help. I still don’t understand why the trackpad would cause this lag. Have it switched off now and using a regular mouse. Hopefully somebody else with the same problem will discover this thread and not be left wondering.