I read lots of pdfs on my 505 and for the most part they're fine. I used to convert them to lrfs using calibre, but anymore I don't even bother. That said, some pdfs are almost unreadable on the 505 and large pictures are useless.
I guess I'm a little lost when it comes to discussing speed. Are we talking page turns? If so, it's not an issue. Switching from book to book can be a little slow.
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