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I have a PocketBook 623 (about 1024x768 screen resolution) and a PocketBook 840 (1600x1200 resolution), and although the latter has a slightly faster CPU and more RAM, the former renders PDF pages much faster. I put it down to the lower screen resolution. This is just a guess, but every PDF rendering software I've seen uses floating-point math for rendering, and the ARM-based ereaders have to emulate that part of it. The more pixels to render, the more emulated math to do. I think these devices would be faster at rendering PDFs if there was software that used fixed-point rather than floating-point math.
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