Lol, yup. The ol’ .NET Optimizer background task.
At a prior job, one of the junior admins updated the master image for our VDI linked-clone desktops. They snapped and deployed that without waiting for that background task to complete. The next day, when people started logging in and the desktop pools started spinning up, we got 70+ complaints that every virtual desktop was un-usably slow. Those were coming in as we were watching our performance monitors say almost every VMware host was at max CPU.
My guess is it’s for the next guy