GNU bug report logs - #72960
31.0.50; PGTK Wayland exhibits more lag than X11 version

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From: Po Lu <luangruo <at> yahoo.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 72960 <at> debbugs.gnu.org, Stephane Travostino <sph <at> combo.cc>
Subject: bug#72960: 31.0.50; PGTK Wayland exhibits more lag than X11 version
Date: Wed, 04 Sep 2024 08:57:43 +0800

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

> Po Lu, any other ideas or suggestions?
>
>> FYI there are other reports online of people noticing major latency in HiDPI mode with the PGTK version, especially when the frame is fullscreen (so there's more pixels to update):  
>> 
>> https://old.reddit.com/r/emacs/comments/ucv0at/awful_performance_with_pgtk_on_wayland/
>> 
>> https://old.reddit.com/r/emacs/comments/1acdieh/pgtk_emacs_high_input_lag_at_large_frame_sizes_on/
>
> I don't doubt what you report is real.

I proposed a theory in a number of other tickets concerning this lag,
specifically that the GTK 3 toolkit cannot take advantage of hardware
accelerated graphics on Wayland, which produces perceptible delays on
large displays.

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