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I can tag around 100 books with a new author in a few seconds. Also, I am not sure why your import is slow - yesterday I imported 50 books in about 2 minutes which seems to be an order of magnitude different to what you are seeing.
What I have found is that Calibre is VERY slow in such actions if you are using a network drive. In that case it can take minutes per book rather than seconds. In otherwords it take around 100 times as long as doing a similar action with the Calibre database on a local drive. That is a lot more than one would expect from the different performance of network drives compared to local drives. I am guessing t is something to do with the way that sqlite performs over a network.
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