Subject: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file

From: Divya Ranjan <[email-masked]>
Date: Thu, 14 Nov 2024 09:32:12 +0000

Hello, Eli

Eli Zaretskii <[email-masked]> 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" <[email-masked]>
>> 
>> 
>> 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.