I have a windows computer that should run any program fluently (i7 8700, Rtx 2080, 32GB RAM, 1TB SSD, and 6TB HDD ). For some reason, my InDesign runs slow and lags a lot. Also sharing for review takes almost forever to load, or it does not share at all.
Sorry to hear about the trouble you are facing. I would like to know if the steps suggested in the post shared above by @Mike Witherell worked for you? If not, I would request you to share a few more details like:
Confirm the exact version of InDesign & OS
Is this happening while working on some particular files or all?