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From: Michael Heerdegen <michael_heerdegen@web.de>
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Subject: Re: Partly deferred font-locking?
Date: Wed, 11 Jan 2023 19:36:05 +0100
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Eli Zaretskii <eliz@gnu.org> writes:

> I think it's basically impossible to know up front which parts of
> fontifications will be expensive and which won't.  For starters, it
> depends on the text around the window.

Probably. OTOH, for some parts it's clear that they are always expensive
(like for the nearly context insensitive dired buffer fontification).

Michael.