Back in the day, Chez Scheme was pretty damn fast: https://github.com/cisco/chezscheme https://github.com/cisco/chezscheme Dybvig went to Cisco and open-source

Back in the day, Chez Scheme was pretty damn fast: https://github.com/cisco/chezscheme https://github.com/cisco/chezscheme Dybvig went to Cisco and open-sourced it. Last I read, Racket lang is swapping over to use Chez as its foundation: https://racket-lang.org https://racket-lang.org I've also heard that HN is written in Arc, which is a Lisp dialect that runs on top of Racket.