bug#72960: 31.0.50; PGTK Wayland exhibits more lag than X11 version

[Po Lu]

Eli Zaretskii <eliz@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.