To do that many entries in that amount of time seems to indicate that the KOA devices are over-powered brutes on the inside.

And that is writing to a database stored on flash (which is relatively slow).
PS: There has been evidence found that Lab126 has been playing with Android on the KOA.
No idea if there is a model in the future or if they where just evaluating that setup.
But that might explain the fast hardware on a simple e-book reader.