Go has more performance if there is some number crunching work but if it comes to APIs or web applications, I don't think so. That techempower benchmark for Phoenix is seriously flawed [3]. We use Elixir in production and according to our benchmarks, the performance is very close to Go or sometimes even better. We also use Plug (which is used by Phoenix underneath) directly if it is just a small API. These benchmarks relates more to our experience. [1] [2]

1. https://github.com/mroth/phoenix-showdown/blob/master/RESULT...

2. https://gist.github.com/omnibs/e5e72b31e6bd25caf39a

3. https://groups.google.com/d/msg/phoenix-talk/hljH55fsqqw/eFX...