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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Major modes using `widen' is a good, even essential,
 programming practice.
Date: Mon, 08 Aug 2022 20:34:40 +0300
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-Reply-To: <jwvy1vy1wj3.fsf-monnier+emacs@gnu.org> (message from Stefan
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: acm@muc.de,  gregory@heytings.org,  emacs-devel@gnu.org
> Date: Mon, 08 Aug 2022 13:22:03 -0400
> 
> >> On my own builds (which are slow on old machines), 18MB typically
> >> results in a delay of just a few seconds.
> > Optimized build or unoptimized?
> 
> Unoptimized.
> 
> > And is that before or after the syntax-wholeline-max limitation?
> 
> Before.  I'm basically talking about the time to do `parse-partial-sexp`
> from BOB to EOB.

Then your old machine is much faster than my new one.