Which is not to say that the general point isn't sound - MD5 was aimed at generating high quality entropy while most non-crypto hashes are aimed at generating entropy-enough fast - but don't use MD5 for crypto stuff anymore.
That has nothing to do with the context of the conversation.
The point is that it was designed to be cryptographically sound -- and therefore more heavily optimised towards entropy over performance -- whereas the need here is for the hypothetical entropy/performance slider.
It's a cryptographic MAC that's almost as fast as MurmurHash. It was designed to be used in hash tables, to protect against denial-of-service attacks from people trying to cause a lot of hash bucket collisions.
Uh, not for a while now...
Which is not to say that the general point isn't sound - MD5 was aimed at generating high quality entropy while most non-crypto hashes are aimed at generating entropy-enough fast - but don't use MD5 for crypto stuff anymore.