That’s true in a lot of cases mainly because of the approach to rendering. So many languages focus on rendering the entire HTML structure before sending the fir

That’s true in a lot of cases mainly because of the approach to rendering. So many languages focus on rendering the entire HTML structure before sending the first byte back, specifically so that the page can be wrapped in a cache. This forces a lot of memory allocation to build up strings and parts of strings that takes time on its own, is often repetitive over the same HTML tags and then all of that has to be garbage collected at the end of the request. The approach taken by Elixir’s Phoenix framework is so fast because it avoids all of those pitfalls. Most people have to do a double take when they see the speed comparisons. Here’s a great write up: https://www.bignerdranch.com/blog/elixir-and-io-lists-part-2-io-lists-in-phoenix/ https://www.bignerdranch.com/blog/elixir-and-io-lists-part-2...