On adding, Calibre is reading the metadata, extracting the cover, checking for possible duplicates, saving the cover, the eBook, and metadata.opf as a backup, and updating the database. So a lot is going on. And if you have any plugins that do something when you add a book, take that into consideration as well.
Last edited by JSWolf; 01-08-2020 at 07:44 PM.
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