In the week or two leading up to ElixirConf I started trying to see how far I could push ExVenture with concurrent players.

I was able to do three simple changes to go from maxing out at 230 concurrent players to maxing out at 3500 concurrent players on the same machine, 15x more players.

https://blog.oestrich.org/2018/09/exventure-performance-tweaks/