Fetching 24 Linux commits = 1.2 GiB

Hi,

I was at 8f3d9f354286 of: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

I did git remote update today and it fetched: Receiving objects: 100% (7330823/7330823), 1.20 GiB It updated master: 8f3d9f354286..8632e9b5645b, that is 24 small commits.

One colleague of mine fetched 1324 commits:
Receiving objects: 100% (6820/6820), 4.21 MiB | 6.70 MiB/s, done.
Resolving deltas: 100% (5114/5114), completed with 1035 local objects.
From git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux
   7e63420847ae..8632e9b5645b  master     -> origin/master

Another colleague fetched the same what I and:
  Receiving objects: 100% (7330823/7330823), 1.20 GiB
too.

I did git gc --prune && git prune now and I am at 1.7G back from 3.5 G.

Is that a bug? What info should I provide?

thanks,