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@RotAnal - the majority of any computation involved in terms of "slowdown" is converting the book to a format it can extract the ISBN from. If your book is an EPUB (or indeed a PDF) then the performance will be as good as it is going to get, for any other format it must convert to EPUB behind the scenes which is where the lag is involved.
The actual time take searching for ISBN's is miniscule by comparison, and it is already optimised to only search a small proportion of pages at the front and back of the book rather than the whole thing.
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