Not sure about the scaling part

I have work on a large application using perl and the readability and maintability where horrendous. The performance where surprisingly good enough (millionsn of request a day); although switching to go (direct translation without any refactoring or usage of fancy go features) yield huge gains in latency and memory usage.

I have work with go, PHP, java, and JavaScript on large application and they all way better than perl. Not even comparable.