But that's some silly engineer tunnel vision, squeezing the very last bit of performance out of a system isn't a goal in itself. You just need it to be efficient enough that it cost you significantly less to run that the amount of revenue it brings you.

I can bet you that moving off Python must have been pitched dozens and dozens of time by Meta engineers, but deemed not worth it, because execution speed isn't the only important characteristic.

So yes, I find it hilarious when HN commenters suggests companies should rewrite all their software into whatever is seen as the most performant one.