When I started with Elixir and Phoenix I wanted to see with my own eyes the speed of functional approach and Erlang in comparing with other well known languages. I just want to compare the simplest possible „Hello world“ in Javascript, PHP and Elixir.

So well, the fully featured fat-lady framework Phoenix with its rounting, view, layout and template runs at the same speed like a pure NodeJS with http. And PHP plain just returning a string is not significant faster.

http://blog.rh-flow.de/2015/10/08/benchmark-helloworld-in-different-frameworks-myelixirstatus/