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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Message #17 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Divya Ranjan <divya <at> subvertising.org>
To: bug-gnu-emacs <at> gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Cc: monnier <at> iro.umontreal.ca, 74281 <at> debbugs.gnu.org
Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
Date: Thu, 14 Nov 2024 11:09:41 +0000

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> I don't understand the question: I thought I pointed at the possible cause by mentioning syntax-directed font lock?

I meant you said the emacs build is "unoptimized", what can be optimized?

Regards,


On 14 November 2024 10:06:41 GMT, Eli Zaretskii <eliz <at> gnu.org> wrote:
>> From: Divya Ranjan <divya <at> subvertising.org>
>> Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>,  74281 <at> debbugs.gnu.org
>> 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?
>
>I don't understand the question: I thought I pointed at the possible
>cause by mentioning syntax-directed font lock?
>
>
>

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

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