Quote:
Originally Posted by JSWolf
It could be that you have a lot of wasted space in the database. Try compacting the database. To do this...
Right click on the library's icon in the toolbar and select Library maintenance > Check library and it will compact the database. Then try running Calibre again and see if it runs faster.
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Hi JSWolf, I had already compacted the DB. I fixed the issue by cleaning up the big metadata.opf files, that somehow modified themselves on the 20th of January of this year.