>>109329738
gamescope --backend wayland -W 3800 -H 2200 -w 3600 -h 2100 -S fit -- ~/env firefox
(~/env shell wrapper is for running xrdb .Xresources etc)
it always spawns an x session (according to firefox about:support) with an upscaled font resolution
on large window size accross 3 monitors getting no noticeable frame drop in firefox picture-in-picture window youtube video spanning the available viewport, while in sway natively it starts to lag at <1fps. same with scrolling the websites. (no such issues in mpv.)
fonts/outlines are weirdly scaled/off pixel grid i guess due to how gamescope works, but didn't see random chunks/rectangles of web pages becoming blurry like in sway