What formats was this book before and now - mobi, prc, txt or pdf. If it was pdf with some background images (i.e. not formatted for Kindle) - it is true - very slow page turning. Prefer mobi/prc and wait some time for indexing after uploading new books to the Kindle's documents folder. I disconnect Kindle and wait 15 minutes without unplugging the device from a USB port when I upload amount of books.
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