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Using ID 2021 on Mac Mini (2018) 6-core i7 under Catalina 10.15.7
After repeatedly being unable to save an edited ID document or place text or other assets and having to kill the application, I found that I always get these problems when using the Mac desktop organizer "Spaces". Once I push the InDesign app onto any other than the default desktop (regardless if there’s a document open or not), all the program’s feedback windows (like when I want to place something) will still open on the default desktop, which is quite a nuisance.
I routinely produce long print books (upwards of 800p). Just like any prior iteration of Indesign I used later than CS6, 2021 isn’t exactly suited for these tasks, as it often takes minutes to update the text flow after I made edits that affect following pages, while sometimes I even have to restart the program to get reliable page previews again. When thinking back to doing the same with ID CS6 on a Core2Duo, that task was usually done VERY much quicker.
(I actually kept this machine until today, for all my solo work that does not require the latest format for interchangeability, because basic typesetting work is, in all, much more reliable than with the CC versions.)
You said you're using a Mac Mini and you told us the processor but not how much RAM you have installed. I suspect that if you're composing 800 page books that RAM might be the limitation.
My experience as a Mac user since the beginning of macOS X, and talking to lots of users, is that very few of them use the Spaces feature. I don't use it and I don't know anyone who does. But I don't see how that would affect text composition. (That's probably why no one else has responded to your quesiton.)
Some off-topic conclusion:
Starting this one thread and writing one answer resulted in three e-mails congratulating me on achieving a new rank and two badges. Maybe it’s just me but I find this gamification stuff childish, bordering on offensive, as I’d much rather be treated as a grown-up by the algorithms as well – especially in an environment where we’re presumably talking pro topics. So I won’t follow this any longer, nor will I engage in other discussions here as long as I can avoid it.
We have raised this issue with the team and they're looking into it.
Sorry about this trouble. I am hopeful that the issue was fixed by now. If not, please try the suggestions shared on this page ( https://community.adobe.com/t5/indesign/resolve-slow-performance-and-unexpected-behavior-of-indesign... ) and let us know how it goes.
Feel free to let us know if you still need assistance. We'd be happy to help.