lithodendron Said:
"iCloud Drive files very very slow to open: Especially a batch of scanned photographs I stored in a Pictures folder in iCloud Drive. Not Photos Library, just a regular folder with pictures that open in Preview.[...]"
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Troubleshooting Lagging iCloud Sync:
Some Things you Can Try:
A. Single Out this User:
See what happens when you create a new Administrator user. Log in to it, seeing if anything is different. If it works, then it is something misconfigured in this current user.
B. Remove Login Items:
Go To: System Preferences > Users & Groups > Click your Username > Login Items > Rid of Terminal, and remove any unnecessary items.
C. Reset the SMC and your NVRAM:
Sometimes when changes are made to the system(i.e. updates), system configurations (i.e. for the keyboard) become manipulated, technically. So, reset the SMC and NVRAM.
D. Try Safe Mode:
[Hold Down shift key] upon boot. In Safe Mode, corrupted system setting files (caches), are intentionally fixed.
- Boot: in Safe Mode
- Log In: as Same User
- Wait: 30 seconds
- Shut Down: the Mac
- Wait: 30 seconds
- Boot: the Mac normally
- Log In: as Same User
- See if can get this to work