I've been having various issues - spinning wheel, slow performance when moving a text box or even just changing a font size. Everything is stutteringly slow.
I'm on the latest version of Indesign CC. Big Sur.
Just now when working on a file everyting slowed right down and then all of my images that were linked and still are linked greyed out and disappeared. No more images in my focument just a blank placeholder. However I just fixed this. Overprint Preview was off. However I do not recall that images disappeared when Overprint preview is off.
Biggest issue is that Indesign is deathly slow on a maxed out MacBook Pro 16".