Under what OS, hardware platform, filesystem, project size, etc.?
Not knee-jerk arguing, genuinely curious. When I compared them on Windows and OpenBSD, I never had a speed difference of more than about 5% (not counting git db repacking), even with a project that had 40,000+ commits, 10+ very active branches, and about 2 GB of code + data.
Admittedly it was probably either the environment or the remote server causing the problem. I was running it under Cygwin on Vista, and it was a fairly huge project. I was running git under the same environment for the same thing (with a different remote origin), and even then I noticed git was much more snappy.
It's nowhere near an actual analysis, just my experience in my limited use (and probably influenced quite a bit by things that I've heard).
