3) Library Maintenance is a menu item on the Library Icon.
It cleans the obsolete records (a 'delete' is just a flag) and packs the data.
the second phase looks for disagreements between the files (found/not found) and what the DB says there should be. YOU have to resolve these manualy.
Slowness can be caused by over aggressive A/V.
Whitelist the Library folder for real time scans (you can leave it for a Regular/manual scan) as the books are scanned when you download to your PC, before adding to Calibre
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