Editor performance issues (2019.3.7f1)

I'm having huge performance issues with my project and I can't figure out what is going on.

1. Whenever I duplicate a prefab Unity takes forever to duplicate it. It seems to constantly re-import things I've never changed. Even if I try to duplicate a tiny image it takes forever.

2. When I save any scene Unity tries to re import a few prefabs that I haven't changed at all. I even see a progress bar appear that displays the names of these objects.

Is there some way I can determine what is going on with my project?

My project is very large at the moment, so I don't know where to start to even debug this issue. I could duplicate the entire project and start deleting assets to see which ones are causing the problem, but I'm not sure this will help. Any suggestions?