I had the same problem. It would take 5 or 6 seconds to turn a page on my sony psr-300. The book was an epub about 350 pages long. It got so bad that a reboot of the device was taking 20 minutes. I assume it was trying to reformat the last book I had opened. If I pushed the font size button I would be in for a 5 minute wait. I tried formatting the flash memory and converting to other formats. I was ready to give up and buy a kindle, but after deleting the PDF and EPUB versions of this book off the device and giving the device some time, my ebook went back to normal operation. I can still read the book in RTF format and it's quick now. But I want to stress that until I actually deleted the epub off the device things were not working the way they should. I'll post back if the device goes crazy again without that epub book.
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