How many ebooks at a time are you updating the tags. A few or hundreds?
How slow is "slow"?
When you update the tags or any info in the metadata screen, the database is updated and so is the metadata.opf file next to the ebook file.
So if you update 2000 books with a new tag, then 2000 metadata.opf files need to be rewritten also.
I don't know if that can be disabled... I've never needed to go looking for such a setting.
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