Comment 2 for bug 758620

I do wonder if this is a dupe. I'm guessing the bytes transferred is actually accurate. My initial guess is that it is splitting the groups up on the server, streaming them as expanded fulltexts, and getting recombined into efficient delta-compressed content locally.
It doesn't make a lot of sense why it would be 1.7GB for a repository that only has 700MB on disk (at least by browsing to the packs/ page and summing up the sizes I see there.)