I'm curious what their performance numbers look like if they host the .git repo on tmpfs -- 15GB isn't unreasonable on a beefy (24-32GB of ram) machine.
Probably the same as the warm cache results, since that's basically what tmpfs is. I wonder if git does all that stat()ing serially or in parallel, though...
I don't have the link handy, but IIRC we did some experiments with that for Mercurial and found that stat() in parallel didn't really help much until you were using NFS or similarly slow network-type latency filesystems.
