Thank you for reporting the issue to us.
In the latest version of InDesign, Id 14.0.3
We have fixed multiple scenarios where the movement of objects was found to be slow.
Please upgrade your InDesign application to the latest version to try out the fix.
If you are unable to see the update yet, go to Creative Cloud desktop application, open the menu (three dots) from the top-right corner and click on ‘Check For App Updates’.
If you face any problems with the new update, do let us know in the comments.
You may also follow the below given link for the list of all fixed issues in Id 14.0.3
iMac 27-inch 2017
running High Sierra 10.13.6
Work for 10-15 seconds, then 10-15 seconds of rainbow wheel, sometimes longer, much longer. It is killing my productivity.
My InDesign file I'm currently working on has 32 pages, with many linked photoshop images and Illustrator files. Multiple fonts due to various ads. Converted some to outlines.
I've turned off Preflight, but it didn't help.