When my computer chokes up an runs slow, a quick check of Task Manager shows it is almost always someone (usually Microsoft or Adobe) force downloading an update while I’m trying to work.
Second guess is a virus; run a full Windows Defender scan overnight and see if anything turns up. Follow up with the free versions of Malwarebytes and Spybot; if all 3 show nothing, you are probably fine on the malware/spyware/virus front.
Beat me to it while I was writing mine on a tablet.
Another thing with anti-virus programs.
If you are running another anit-virus program other than Windows Defender make sure you disable Windows Defender otherwise they will conflict and cause you problems.
Made that mistake.