Running Linux mint 19.2 with all the latest updates and the video drivers from NVIDIA installed.
Upon logging in, the desktop is very snappy, even with multiple windows open. Switching windows is fast, scrolling is fast, typing is fast.
If I let this desktop sit logged in until the next day, it is unusably slow. Alt-tab takes 2-3 seconds to pop up the windows list, typing is slow.
Logging out and logging back in fixes it.
I've checked ssd space, CPU and memory with
htop (64gb, plenty left), etc and I don't see any glaring culprits.
update: today after the machine has been running over the weekend with me logged in, I notice
cinnamon --replace is using 60-70% cpu