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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: master 2c79a8f 2/2: Use posix_spawn if possible.
Date: Sat, 02 Jan 2021 08:53:00 +0200
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> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Sat, 02 Jan 2021 01:12:36 +0000
> 
> > posix_spawn is supposed to be significantly faster than fork/exec on
> > macOS and Cygwin.
> 
> Thanks Alan, useful info. However Philipp started with Linux, so there
> ought to also be something useful there that motivated these patches. I
> would be interested to learn what helps on Linux.

AFAIK, the speedup also happens on GNU/Linux.