Comment 9 for bug 246891

I just did some timings with the development6-rich-root repository format available since 1.14. It helps quite a bit relative to the default pack-0.92 repository format. Timings are with the lp:bzr repository with 4324 revisions in it:

log -v, pack-0.92: 2m34s
log -v, development6-rich-root: 0m46s

To get a development6-rich-root repository I did "bzr upgrade --development6-rich-root" from inside my branch of lp:bzr. Performing the format upgrade took something like four hours, so doing that on a bigger repository like the emacs one can take quite some time.