Using iCloud for Windows and OneDrive Folders open slowly
I had a similar problem. My folders in OneDrive and iCloud Drive opened very slowly. I tried to reinstall both OneDrive and iCloud Drive, nothing helped. But I found the reason, the most important thing is that you need to install the iCloud drive not from the Microsoft store, but you need to download it from a source on the Internet and install it. This problem immediately disappeared for me.
Windows, Windows 6