Fish's execve is slow

OK. Funny story. If you run programs in the Fish shell, it is slow. Try this out yourself.

spawn.c

#include <unistd.h>

int main(int argc, char **argv) {
	argv += 1;
	execvp(argv[0], argv);
}

hello.clj

(println "hello world")

time bb hello.clj # this is slower than the rest
time /usr/bin/bb hello.clj
clang spawn.c -o spawn
time ./spawn bb hello.clj

If you don’t have Babashka installed, you can probably modify this to use Python.

It turns out Rust doesn’t make everything fast.