If speed is the most important factor, a more interesting comparison would be to parallel-bash: https://www.gnu.org/software/parallel/parallel_alternatives.htm

If speed is the most important factor, a more interesting comparison would be to parallel-bash: https://www.gnu.org/software/parallel/parallel_alternatives.html#differences-between-parallel-bash-and-gnu-parallel https://www.gnu.org/software/parallel/parallel_alternatives....