After upgrading to Catalina and the recent update the system becomes very warm. Just starting up, and no programs started, within a couple of minutes the fan starts. My MacBook becomes very warm. Anyone having the same problem.
I had looked at activity monitor since mine seemed somewhat warm - the app that seemed to be using the most was the one that "organizes" the photos. After a few days the heat issue seemed to dissapear so I assume whatever the Mac was doing is done.