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AFAIK it doesn't write changes until after you review last book - I say that because after reviewing the last book it displays one of the horizontal progress bars that flicks through the list of books
It slow because a) the servers and network are slow b) more metadata source PIs you have configured the slower it gets c) I believe that metadata downloading is throttled - because the folks who provide the metadata (for free) have complained about bandwidth usage, I think someone said they threatened to block access to their databases to all calibre users.
BR
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