Installed Ubuntu 20.04 (from scratch - not an upgrade) a week ago still struggling with very slow video. (even when no other applications is operating - just playing solitaire goes very slow. The cpu is working like crazy ...
I use Dell Inspiron 3580. with intel core i3-7020U. graphics - Intel Mesa HD Graphics 620
The problem was not solved but worsened - and then my computer refused to boot. I suspected hardware problem but the lab said it was software (well - no warranty applies ...:( The disk was formatted, Ubuntu 20.04 re installed. and just to be on the safe side I rebooted after each and every application I installed. and lo and behold - immediately after my first Zoom meeting - everything went south once again.
again the cpu is overworking for no apparent reason and everything goes slow even when Zoom is not working..
Trouble is that nowadays I can't do without it.. (and choosing another video conferencing application is not up to me... )
Update: I have reinstalled 18.04. Everything works just fine. I don't know what had happened but now I can do my proper work...