Mail Not Loading or Slow Loading Messages from iCloud
I am running Apple Mail 13.4 Catalina 10.15.7 on a 2018 Mac mini. Mail is not loading Messages from my iCloud account. My Gmail account is loading fine. When Messages do load, it takes 1 to 3 minutes for images to load. In my Viewer Window, there is a box in the lower left corner that states "Moving Messages 1 of 141". It had been stuck at 1 of 141 since I've launched Mail. This issue has been ongoing for the last few days on this machine. Mail from the same account is loading with no problems on my iPhone and on my MacBook Pro with the same OS and version of Mail, so I'm thinking whatever is going on is withing this Mac mini. The Mac mini has 73 GB available on a 500 GB drive.
Mac mini, macOS 10.15