Hi there, I think I'm facing the very same problem, and was't able to get rid of it even doing a clean reinstall after buying a new MacBook Pro! Recap: - InDesign goes in ball-spinning mode every time I come back to the application from other windows (eg: going to finder or browser, then go back to InDesign) - Spinning is proportional to document length, could be undetectable but after 50+ pages gets some seconds - I have a 500 pages document where I'm waiting 1:40 minutes after each change of window focus!! - It is font related for sure - Changing all fonts to something different (eg. Times New Roman) solves the issue - I'm using Font Explorer Pro but also tried without it, even never installing it on the new machine, no change - Experiencing it on High Sierra on MacBook Pro 2012 and then on Mojave on the very new MacBook Pro 2018 with no time machine restore but a clean install from zero. No preferences, settings, plugins, font manager were imported. Just plain InDesign freshly downloaded from CC app - The only thing that stays the same is my Fonts collection. I guess there's something InDesign is checking about fonts everytime you focus back to the app, like font changes, font un/installations or stuff like that. Seems this "check" is done on each text frame that's why the waiting time it's proportional to doc length - Of course tried all the most common "customer care copy/paste solutions", please refrain from posting "reset preferences" again, thanks.. - Of course, the very same document package including fonts, sent to colleagues with the same Mac & InDesign are working fine, AND they work fine on a PC. NO SOLUTION at the moment. Totally stuck. Adobe InDesign developers are in touch, send them docs and movies but cannot replicate it. Help.
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