Hi!

>   2. Performance.  

At a higher level, we can work on parallelization of builds and
downloads (all combinations).

Many improvements were suggested in this thread:

  https://lists.gnu.org/archive/html/guix-devel/2019-10/msg00694.html

Julien sent a patch to enable parallel downloads:

  https://issues.guix.info/issue/39728

This could significantly improve the user experience.

Cheers!

-- 
Pierre Neidhardt
https://ambrevar.xyz/