Martin Fick [off-list ref] writes:
After a gc, the repo does perform the similar to the
uncompressed one (which was achieved via gc). After gc, it
takes ~.05s do to a 'git branch' with 1.7.6 and
git.1.7.7.rc0.72.g4b5ea. It also takes a bit more than 15s
with the patch reverted. So it appears that compression is
not likely the culprit, but rather the need to be gced.
Isn't packing refs part of "gc" these days?