Why are Phoenix and Plug pretty slow compared to even Ruby/Python web frameworks?

At https://github.com/tbrand/which_is_the_fastest there’s comparison of the web frameworks.

It can give you a high level idea. And that is, Phoenix and Plug are slow compared to, for instance, Ruby and its framework Roda. Ruby/Roda is faster. Or at least roughly more or less the same as Phoenix and Plug.

I thought Phoenix and Plug would very well beat ruby and python with a magnitude of several times. But that’s not the case.

Why are Phoenix and Plug so slow?

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