Supposedly improvements in hardware acceleration have changed this but IME a window manager with no compositing is way faster than phosh. I use fluxbox and on that firefox scrolls in real time for example.
How does fluxbox works on mobile? Is it basically the same than the desktop on a small resolution, or it can receive phone calls and have a notification bar?
It's also a pure wayland system, so it's quite unlike what we're used on desktop.
When you say "pure", do you mean "no XWayland"?