Actually i find it's quite slow. Recovery software such as FinderOuter could achieve 64 address key/second on i3[3].
I suppose it's difficult to say without knowing anything about his implementation.I agree. But it's true it could be far faster.
Maybe I've misread/misunderstood something or calculated incorrectly. I'm always happy to be corrected 
Actually i made i typo, what i meant is "64 thousand address per second on i3".