I didn't notice to much performance issue switching to PGTK on an ultrawide on Niri. Are you using the daemon to render Emacs as a client?

▲

zeendo 6 hours ago | parent [-]

I have perf issues with emacs-pgtk on a 4k screen on Wayland with Niri in both Emacs as a client and not. The issues appear with typing or scolling, the delay and lag become noticeable.

For me the issue is only unbearable when running fractional scaling, for some reason.

I'm going to try the branch mentioned in the sibling comment, though.

▲

arikrahman 6 hours ago | parent [-]

I have almost the exact same setup as you and even have strange behavior with fractional scrolling. I'm on NixOS so the setup is even inspectable: https://codeberg.org/arik/dotfiles

After resetting the scale from 1.2 to 1.0 through 'niri msg output HDMI-A-2 scale 1' I actually noticed a performance increase! I will have to troubleshoot this, although you may have stumbled on a great lead toward the root cause.

	▲	green7ea 5 hours ago \| parent \| next [-]
		I'm also on Emacs and Niri, seems to be a popular combo, and I don't have any performance problem. At home I'm driving an Ultrawide (3440x1440@75Hz) at scale 1.1. At work I'm driving two 4k screens at scale 1.2. I might be less sensitive to latency but it could also be a graphics driver issue or something similar. I'm using Arch with emacs-wayland (pgtk) with a strix halo (all AMD) laptop.
	▲	zeendo 5 hours ago \| parent \| prev [-]
		I didn't invent this mitigation FWIW - I saw it mentioned in one or another thread about this by someone else - possibly on the big reddit thread on this topic, not sure.