I had the same issue with a Surface Book 3 running Win11. It seemed more pronounced after the Win11 upgrade. But it was still bad on 10. The eventual fix was

I had the same issue with a Surface Book 3 running Win11. It seemed more pronounced after the Win11 upgrade. But it was still bad on 10. The eventual fix was switching machines to one with 32gb RAM. Smooth like butter now. Yes it is ridiculous that 16gb is not enough for day to day stuff.