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website: faster-substitutes: Tweak. 

* website/drafts/faster-substitutes.md: Change title; tweak.
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title: Towards faster substitutes
date: 2021-03-25 13:00
title: Getting bytes to disk more quickly
date: 2021-03-26 14:00
author: Ludovic Courtès
tags: Reproducible builds, Scheme API
---
@ -14,16 +14,20 @@ Guix System for the first time.
With that in mind, it should come as no surprise that Michael
Stapelberg’s [excellent 2020 Arch Linux Conference
talk](https://media.ccc.de/v/arch-conf-online-2020-6387-distri-researching-fast-linux-package-management)
and the installation speed achieved with distri were a great motivation
and the installation speed achieved by distri were a great motivation
boost. Michael proposes radical ideas to speed up package installation,
such as downloading and mounting ready-to-use SquashFS images. This
cannot be transposed to Guix as-is, but it certainly got us thinking.
such as downloading and mounting ready-to-use SquashFS images. Not
everything can be transposed to Guix as-is, but it certainly got us
thinking.
This article dives into improvements made over the last few months and
that will be in the upcoming 1.2.1 release; they all contribute to
making substitute download and installation “faster”. This is an
evolution of the existing mechanisms rather than a revolution, but one
that users will surely welcome.
This article dives into improvements made over the last few months that
will be in the upcoming 1.2.1 release, and which are already [one `guix
pull`
away](https://guix.gnu.org/manual/en/html_node/Upgrading-Guix.html);
they all contribute to making [substitute
download](https://guix.gnu.org/manual/en/html_node/Substitutes.html) and
installation “faster”. This is an evolution of the existing mechanisms
rather than a revolution, but one that users will surely welcome.
# Reducing latency