Prior to this, I was seeing 1 file per 5 seconds!

If you’re suffering from a super slow onedrive sync on a mac, then these steps might help. 

Note this worked in June 2020..

• Quit OneDrive. (Select the cloud icon in the top tray, then select Settings > Quit OneDrive.)
• Find OneDrive in your Applications folder.
• Right-click OneDrive and select Show Package Contents.
• Browse to the Contents > Resources folder.
• Double-click ResetOneDriveApp.command (or ResetOneDriveAppStandalone.command, if you’re using the standalone app).
• Start OneDrive and finish the setup process