> From: Richard Copley <rcopley@gmail.com>
> Date: Thu, 16 Nov 2017 20:45:36 +0000
> Cc: Eli Zaretskii <eliz@gnu.org>, Jostein Kjønigsen <jostein@secure.kjonigsen.net>,
> Emacs developers <emacs-devel@gnu.org>, Jostein Kjønigsen <jostein@kjonigsen.net>,
> Drew Adams <drew.adams@oracle.com>, Phillip Lord <phillip.lord@russet.org.uk>
>
> Windows is ridiculously slow to start a new process.
You mean Cygwin and MSYS, not Windows itself, right? Because 99.99%
of process starting during the build is MSYS Bash starting GCC, Grep,
Find, and other programs.