559.7ms
So they optimized something from a half second to something in the microseconds. That's certainly cool, but imo not the place to spend time optimizing. Especially since it's probably mostly startup time, since the difference between the benchmark and bigger schema is 100ms in JS and 15x in Rust.
When you say "fast JS runtime," did you try bun
? AFAIK, it is supposed to have way better startup time than V8.
It's certainly cool though!