[libvirt] Repack git repo?

So I was checking out the repo the other day and it took ages. So it got me thinking what might be the problem. Looks like a part of it is that our pack is split among ~250 files. Therefore when somebody does checkout git needs to repack it into a single pack every time. And this may take ages on such slow processor as Atom is. However, reading some docs on this it looks like 'git gc --aggressive' is not advised rather than 'git repack'. Any thoughts? Michal