Same here.....I started this topic on it about my Mac Pro:
https://forums.macrumors.com/threads/1411082/
I still get the stuttering even when I hide the dock.
What's interesting is.....switching desktops via the keyboard (ie. Control + Desktop number)....is pretty smooth.
It's when I use CMD+TAB or click on an app icon that the switching is stuttery.
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I also notice on mine stuttering when I go to do a selection screenshot:
CMD + Control + Shift + 4
The crosshairs that popup with the coordinates are stutterey as I move the mouse.
Someone posted this to fix the crosshairs:
https://forums.macrumors.com/posts/15348217/
Hoping it's just graphic drivers issues since I have the best video card Apple offers.
-Kevin