GNU bug report logs - #76504
31.0.50; Excessive redisplay when display-line-numbers-mode is enabled

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Message #24 received at 76504-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: dm <at> mssdvd.com
Cc: 76504-done <at> debbugs.gnu.org
Subject: Re: bug#76504: 31.0.50;
 Excessive redisplay when display-line-numbers-mode is enabled
Date: Sun, 09 Mar 2025 11:23:55 +0200

> Cc: 76504 <at> debbugs.gnu.org
> Date: Sun, 23 Feb 2025 20:42:16 +0200
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> > From: Davide Masserut <dm <at> mssdvd.com>
> > Date: Sun, 23 Feb 2025 18:45:49 +0100
> > 
> > Eli Zaretskii <eliz <at> gnu.org> writes:
> > 
> > > What is your keyboard auto-repeat rate on that system?
> > 
> > 50 character per second, but I just did the same test with auto-repeat
> > set at 25 c/s and got the same results (21,480 / 1,875 = 11.456).
> > 
> > However, the difference in behaviour is much smaller, as you probably
> > expected.
> > [...]
> > The same test with auto-repeat set to 50 c/s and the balanced power
> > profile results in a 4.6 factor (10,053 / 2,165).
> 
> With 50 or with 25 c/s?
> 
> > > Anyway, what's important is the time it takes to scroll through a file
> > > with and without line numbers.  So please try the command below and
> > > post the times it reports after scrolling through some large file with
> > > and without the line numbers:
> > >
> > > (defun scroll-up-benchmark ()
> > >   (interactive)
> > >   (let ((oldgc gcs-done)
> > >         (oldtime (float-time)))
> > >     (condition-case nil (while t (scroll-up) (redisplay))
> > >       (error (message "GCs: %d Elapsed time: %f seconds"
> > >                       (- gcs-done oldgc) (- (float-time) oldtime))))))
> > 
> > xdisp.c power-saver
> > GCs: 492 Elapsed time: 55.600977 seconds
> > GCs: 493 Elapsed time: 55.490811 seconds
> > 
> > xdisp.c power-saver line numbers
> > GCs: 488 Elapsed time: 66.925708 seconds
> > GCs: 495 Elapsed time: 66.195398 seconds
> > 
> > xdisp.c balanced
> > GCs: 491 Elapsed time: 26.969390 seconds
> > GCs: 492 Elapsed time: 27.098322 seconds
> > 
> > xdisp.c balanced line numbers
> > GCs: 494 Elapsed time: 32.596467 seconds
> > GCs: 494 Elapsed time: 32.593883 seconds
> 
> This is what I expect to see: line-number display slows down redisplay
> by about 10% to 20%.
> 
> I see no bug here.

No further comments, so I'm closing this bug.

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