The first time I load my project it takes around 4 minutes. If I then close and re-open it, it loads pretty quickly. Restart the PC and then I’m back to 4 minutes.
Editor log says ImportAndPostprocessOutOfDateAssets is taking all the time. Is there anything I can do about this?
Wild guess: is your PC clock correct? E.g. on my PC I had the motherboard battery die, which means after restart the date was like “a week ago” compared to the actual date, until several hours later Windows decided to synchronize time with some server. If a project is opened at that time, Unity would sometimes go “whee now is Feb 25 but the file modification date is Mar 1, I must reimport this!”
Even with 2020.1 and 2020.2 some time it randomly trigger again an import. Happen often when doing a full reimport after an upgrade, like it’s not saving the current state and reimport almost everything a second time.