I should note that I did a system reset BEFORE uninstalling the update and the problem was still there, so it wasn't any sort of program issue as the reset wiped all my programs.

Also had a scare...

Uninstalled the KB4103727 update & it seems to be performing better so far, will post an update in a couple days or so.

I've been having trouble as well. I make music with Ableton Live & was working on something one night with no trouble at all, but when I came to the EXACT same project the next day Abletons own CPU...