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I can't say anything definite about 1, although I should think it has to do with the reader. These things aren't exactly supercomputers after all. However, on the Sony readers at least you can install custom firmware found here (PRS+) and turn off memory card scanning on device start. That's solved that particular problem for me, as well as provided numerous other benefits. Highly recommended if you have a Sony.
As far as point 2 goes, I have tested cards from classes 4-10 (maybe a class 2 as well; can't quite remember right now) and found no discernible differences whatsoever. That being said you should buy the fastest card possible, or that you can afford regardless, in case you want to use it for something different at some point. Photography and video in particular does benefit considerably from a fast card.
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