Elixir NIF performance compared to native C++

Are you able to share the code? It would be easier this way to say something sensible about it.
But from my own experience it’s quite difficult to measure between 2 platforms in a correct way.
(I’m using rustler myself and performance seems to be faster on the 100% rust side, I have never seen the elixir/NIF part being faster because of the (sometimes little) overhead crossing the NIF bridge)