[Mikeb85]

Faster than Python 3 means little and the discussion is mainly about languages which compile to native code and have certain features.

Erlang is a super cool language and were I doing an app which needs millions of concurrent connections over many cores and/or machines, I'd choose it in a second. But Crystal is more of a (potential) replacement for Java or C++.

[ZephyrP]

I get where you are coming from (although, in the case mentioned above at least, an order of magnitude faster places it within 150% of the speed of Java). I think you're only scratching the surface of Erlang here though. I believe "networked services", "millions of connections" and "hot-code reloading" are a meme that hides the Erlang's real utility.

Along these lines, the most popular open-source subdivision 3d modeling software package is, outside of the shaders, written top-to-bottom in Erlang (including the engine).