1424121: 1628: Database: CTagSaveInfo::SaveTag: Failed to move file to \\DISKSTATION\home\CloudSync\OneDrive-SOTS\_mm\Rock & Pop\Ahnnu - Special Forces\1 - 02 - The terrible one.mp3
1424121: 1628: Database: CTagSaveInfo::SaveTag: Finish (result: 0) (269594 ms)
\\DISKSTATION\home\CloudSync\OneDrive-SOTSIs this a Synology with CloudSync service enabled to OneDrive?
If you have CloudSync to Onedrive enabled on this folder, then you probably should not be importing that folder into MC.
When MC changes any tag on the file (thus modifying the file), the Synology will detect the change and will want to re-upload the entire file, which may hang MC until that operation is complete or fails. This may explain the slow operations, lockups, and MC crashes.
You can set MC to save tags on separate "sidecar.xml" files, which would avoid this problem - the media files themselves would remain untouched. You may not want this however, if you need the Tags to be displayed on the LCD of a DLNA player.