My suggestion is write it and measure. My instinct is that when you find a domain where there’s a performance improvement over Enum, (let’s say, 10% better than enum) you are in a regime where the Stream penalty is worth it, and you’re say… only 2% better than Stream.
Ultimately, you will be hamstrung by speed of the erlang datatypes. If you need better, you should write a nif or something. But really I don’t understand the obsession with performance. For most domains where you’re using Elixir, other things, like network or database, dominate your performance concerns.
