Comment by marosgrego

Also

  git clone https://git.sr.ht/~mcf/cproc
  cd cproc
  git submodule init --update
  time make qbe
  time make

generates:

  make qbe  0.81s user 0.07s system 97% cpu 0.901 total
  make  0.83s user 0.07s system 99% cpu 0.902 total