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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Is it possible to change the recv buffer size dynamically for
 network process or subprocess?
Date: Sun, 22 Mar 2020 19:00:50 +0200
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To: Robert Pluim <rpluim@gmail.com>
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> From: Robert Pluim <rpluim@gmail.com>
> Date: Sun, 22 Mar 2020 16:12:31 +0100
> Cc: emacs-devel@gnu.org
> 
> Anyway, emacs-27 has read-process-output-max, which I guess you could
> set to 4, but I suspect that will cause all sorts of other issues.

Almost certainly.  I won't recommend any measure like that without
some serious profiling that suggests this is indeed a significant
factor (and I'd be surprised if it is).