Recently I used nixos on one of my machines. And I noticed people there use tar balls for fetching package definitions. And It worked much faster for me.

That was surprising and I decided to write this letter.

Is git the right tool for getting new package definitions? What if git commits history will become enormous? 

As I see, first guix pull running too long for a lot of people.

Probably there are ways to cache all of this.

Anyway,  I'm just curious about it. If there are already answers for my question, I would like to read them.