I've prepared lots of material for my own use on the 500 and 505 readers using PDF with embedded fonts. Yes, there's an appreciable difference in page-turn time from lrf files without embedded fonts. Appreciable when I make a deliberate comparison, that is, but I wouldn't call it dramatic even then, and it's negligible in practice (when I'm just reading). The delay before the flash to the new page is increased by a fraction of a second, that's all; the total page-turn time is still ~1 second.
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