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Do you have a lot of duplicate authors? Feel free to PM me details if you prefer.
I do suspect I know what the issue is if that is indeed the case. I tried not to change the underlying approach which is to get a list of authors only and compare their names. Whereas the 1.9.7 version iterates across all the books, and then compares the authors from those books.
Iterating just across the author names would ordinarily be the faster approach. But the downside now is that I do not have the details of the books for that author, and instead have to run an additional search to retrieve them in the case where they are showing up as a duplicate.
For only a handful of duplicate authors I would not expect this to be a problem. If you have hundreds or thousands I can imagine this not scaling well...
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