Between arbitrary individual functions you might encounter, there can be differences, but only in the sense that it could happen between Erlang and Erlang if the functions had different implementations or degrees of optimization or optimization choices.

Worth noting for prospective adopters is that you can seamlessly call Erlang functions from Elixir by adding a : prefix, such as :random.uniform(), and there's no weird overhead or surprises involved.

- all uppercase elixir atoms / module names adding "Elixir." prefix

- idiomatic Elixir code uses structs (sugar over maps), where Erlang uses records (sugar over tuples)

- some other idiomatic Elixir code has overhead over Erlang, for example access operator []