Performance is a weird metric for a web application. You can say Go or Rust will be more performant than Ruby or Lua, sure. But with web applications so often your performance has nothing to do with the language or hiccup. But you aren't just processing N requests and spitting out a response, you are communicating with other services and databases. IO is almost always a bigger source of latency in response than language speed, until you have a large enough service where you can start to worry about those small issues. Before the Developer performance matters more.