I've found the same "issue" with reading some PDF's on mine. I put it down to the fact that reflowing several hundred pages of text on a format that isn't designed for reflowing is hard on it's CPU. I imagine the 505 only reflows a couple of pages at a time to cut down on the initial opening time. The more complex the PDF, the more noticeable the pause is too. Heck, reflowing a PDF on my PC takes a little while too, and it's FAR more powerful than the 505.
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