GNU bug report logs - #74281
30.0.91; font-lock mode hangs on scrolling large Scheme file

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Package: emacs;

Reported by: Divya Ranjan <divya <at> subvertising.org>

Date: Sat, 9 Nov 2024 16:06:01 UTC

Severity: normal

Found in version 30.0.91

Done: Stefan Monnier <monnier <at> iro.umontreal.ca>

Bug is archived. No further changes may be made.

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From: Divya Ranjan <divya <at> subvertising.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, 74281 <at> debbugs.gnu.org
Subject: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
Date: Thu, 14 Nov 2024 09:32:12 +0000

Hello, Eli

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Date: Sat, 09 Nov 2024 16:04:13 +0000
>> From:  Divya Ranjan via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
>> 
>> 
>> 1. In emacs -Q, open a fairly big Scheme file (> 70k) and try to move in
>> the file with C-n, C-f or mouse scrolling. It sverely lags for several
>> seconds, doesn’t even respond to C-g.
>
> I can only reproduce this with C-p when moving from the end of the
> file.  C-n and C-f are instantaneous here, even though this is an
> unoptimized build of Emacs 30.

I see, well its the latest build of emacs on GNU Guix, so yeah. Which lacking features in particular do you think might be causing this?

Regards,
-- 
Divya Ranjan,
Philosophy, Mathematics, Libre Software.
This bug report was last modified 140 days ago.

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