This is a trivial implementation of a Wayland compositor using pywm - it serves as its reference implementation and to profile / identify and fix performance issues (at the moment this is focused on an unnecessarily high idle cpu load).
pywm-fullscreen takes various command line options, most importantly -e (as in -e firefox), an application to run and display fullscreen. Check out args.py for all arguments.
Install via pip or nix flake.