A friend of mine has a Droid: the original. It was updated to Froyo ages ago, but he commented that he didn't see much of a performance benefit.

Turns out that not all Froyo builds got the JIT that we got with our Nexus Ones. I don't know why. Maybe CPU architecture? Anyway, the Droid didn't get it. There's, unfortunately, no reason to expect that other Froyo builds did. I mean, I'm sure some did, maybe even most, but definitely not all.