This video really demonstrates the power of Elixir: https://t.co/dXljW61NYt?amp=1
Here is the source code for this:
It requires a really old version of node (8.3.0).
The demo mostly works with the latest version of Elixir. One of the buttons to set the number of processes does not work, however calling the function in the iex session does work.
I managed to get 10k processes running on a MacBook.