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Lag is part of the nature of e-ink. E-ink doesn't have a fast refresh rate, and that's why the zooming and panning is slow compared to LCD screens. All 9.7" e-ink screens are the same screen used in different devices, which is why there isn't that much difference between them.
I have an Kindle 3, and personally, I wouldn't recommend using it to read manga in Japanese because it is too small.
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