Don't use functional programming languages

You aren’t God.

You are a programmer. Use a language that maps to how you think. That’s fast.

Using an unnatural language? That’s slow.

Plus of course python has way more library support, stackoverflow support, reddit support, friend support, better gpt support, and programmer market liquidity.

JaneStreet of Ocaml fame has had to write everything themselves in Ocaml…because nobody else wrote it in Ocaml. That’s slow. Yes they’re good, but not because of Ocaml. At best, you could say a Prop shop needs to write everything anyways for security reasons so its less slow, but I doubt even that’s true.

Now functional programming ideas. Like map, filter, reduce. Those are great, go study them. I highly recommend SICP, posibly the greatest book on programming ever written. It uses LISP, but only as a teaching device to express the books ideas.