I&#x27;m pretty sure this doesn&#x27;t measure what it claims. It&#x27;s a mostly sequential flow with very little meaningful concurrent work going on. I would imagine a for loop would put all of those to shame. I&#x27;m not sure why anyone would optimize their runtime for what&#x27;s basically yet another process ring benchmark but I know it&#x27;s gotten slower over time on a couple of the measured cases because it&#x27;s just not a real example and making this fast trades off other things like good scheduler balancing.<p>Also check out Pony if you want something were spawn and send become basically free. It&#x27;ll run pretty close to for-loop speed for the number adding which should be a baseline calculated in all implementations.