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If you never turn on bookshelf view and never add pages column to either book list view or book details the pages column will not be auto filled for your existing library. Newly added books will be page counted, that's all. And page counting takes a few milliseconds per book and is done asynchrously so will have no noticeable impact. Also, IIRC, page counting does not update metadata.opf. It's a generated value, like size (which is also updated everytime a new book is added), so no point storing it in metadata.opf
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