I’ve just replaced MetroHash with CityHash and get 1000x (30ms instead of 30s) hashing speedup. It seems I somehow screwed MetroHash really bad. #cpp
Actually, the answer is straightforward: looking at their GitHub, they are in fact using a very old version of MeowHash (much older than even v0.4) which _was_ slower on small inputs and _did_ require alignment. Not sure why they haven't updated to a newer one.