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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%
Date: Mon, 06 Sep 2021 22:23:01 +0300
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To: Alan Mackenzie <acm@muc.de>
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In-Reply-To: <YTZnPVKw2NLAvzi4@ACM> (message from Alan Mackenzie on Mon, 6 Sep
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> Date: Mon, 6 Sep 2021 19:08:45 +0000
> Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org
> From: Alan Mackenzie <acm@muc.de>
> 
> (It is notable that redisplay is quite a bit slower in X at 54 lines
> than on a Linux console at 65 lines.)

That's expected: TTY display skips some stuff that is only needed on
GUI frames, so it's faster.

> So, based on these timings, I would suggest a new jit-lock-chunk-size of
> 1500.

Agreed.  Please be sure to include a reference to this message in the
commit log message, when you install the change.

Thanks.