Elixir definitely comes up short on raw computation. However we've been very satisfied with it for implementing a database. Use data oriented design (you want that anyway) and move any CPU intensive part into a native function. It's pretty straightforward to bind a C/C++/Rust library.
Considering the massive growth in AI that makes Elixir only half a solution then unless you're good with low-level languages such as C/C++/Rust. Scala and Clojure, on the other hand, are good for both computation and IO so I don't really see the advantage of Elixir.
