I have both and I can confirm igorsk's opinion - there is no difference in speed between them. What does make a difference is the number of books installed. I currently have 2300 epubs on the 650 and 1830 epubs on the 350. The latter is marginally faster. On reducing the 350 to just 100 epubs it was much quicker. If you want to keep your ereader operating at maximum speed, keep the number of books installed as low as possible.
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