@lorabe@floss.social phosh itself doesn't render that much, so maybe aside of smoother scrolling in app list it won't really matter for performance - the apps getting ported matter much more. Using GTK4 with GL in phosh will enable us to make it more fancy though, so it's still desirable.
However, we need something like https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/2992 to get merged first before that can happen.