They can go plenty fast (video from 2011 on E Ink Pearl):
Logically it's therefore mostly about the video processor and the CPU.
Contemporary (2012) on the Nook:
More recently (2015) on the Yotaphone 2:
Battery life would be as bad as on LCD I'm sure while doing that, but normally I imagine you wouldn't be watching videos or playing motion-heavy games much. :P
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