While Erlang VM is pretty good with io in general, stdout is not very performant. The logic here is that when you need stdout you’re likely to be in anger,and even more likely, needing to capture stdout on another node across the distributed cluster. Also, io events should be atomic. We don’t want a situation where one process is writing some content to io and another process scoots in, blats something out, rudely interrupting the content you cared about.
Default Std io in Erlang goes through something called the group leader which is a single highly bottlenecked process that has lots of capabilities for interacting in concurrent systems in a sane fashion. It’s effectively handling lots of coordination. So expecting stdio to be performant in elixir is not a good idea. Why not write to a file or socket instead?
