bug#41702: `guix environment` performance issues

[Lars-Dominik Braun]

Hi Ludo,

> --8<---------------cut here---------------start------------->8---
> $ time guix environment --ad-hoc r-learnr --search-paths
> export 
> PATH="/gnu/store/n4wxbmqpafjfyawrla8xymzzdm5hxwph-profile/bin${PATH:+:}$PATH"
> 
> real  0m11.328s
> user  0m20.155s
> sys   0m0.172s
> $ time ./pre-inst-env guix environment --ad-hoc r-learnr --search-paths
> export 
> PATH="/gnu/store/if6z77la3mx0qdzvcyl4qv9i5cyp48i0-profile/bin${PATH:+:}$PATH"
> 
> real  0m4.602s
> user  0m6.189s
> sys   0m0.136s
> --8<---------------cut here---------------end--------------->8---
that’s awesome and brings me much closer to my goal of running all applications
inside a `guix environment` container for reproducibility. Including the
protocol fixes from #41720 I’m now down to ~30s from ~50s, which may be called
somewhat usable. Obviously I’d be very interested in further speedups.

Thanks,
Lars

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