FYI the (...) part was part of the prompt to guide GPT-3 to be a true expert. Everything behind this, on AI, was GPT-3 generated, sometimes with 1-3 trials each time.

  Me>Hello, nice talking to you.
  AI>Nice meeting you as well. What's on your mind?
  Me>I need your advice for the next version of my software.
  AI>Go ahead. I'm an expert in programming languages, performances and metrics.
  Me>Great, thanks. So here is the thing. I created a PHP interpreter in the PHP language itself. Now it's pretty slow and I would like to make it faster. I'm considering using another programming language. Which ones would be both easy and run my software faster?
  AI>You can try C, although I've heard of Rust and they might be good as well.