EDIT: It seems that at least MY issue is related to iCloud Drive!
I just recently updated to Sequoia and am having major Finder freezing issues, including any application open/save dialogs, Finder window searches, and general navigation. ANY of these actions are immediately followed by a 15-30 second delay, often while showing the Spinning Pinwheel of Death (SPOD).
Drag-and-Drop is a whole other issue, as the selected files are never released when un-clicking the mouse (which makes Force Quitting the Finder almost impossible.
Troubleshooting:
- Rebooted (no change)
- Repaired disk Permissions (no problems)
- Relaunched Finder (no change)
- Checked if Spotlight Is indexing (it's not)
- Checked disk space (plenty)
- Delete the Finder Preferences File (no change)
- Rebooted in Safe Mode (It actually seemed worse!)
- Booted into Recovery Mode and reinstalled the OS (no change)
- Turned off System Settings > Apple Account > iCloud > Drive > Sync this Mac (PROBLEM GONE!)