Rust, [partially] OCaml and [partially] Elixir come to mind. Elixir is much slower than those two but for the value it brings to the table, is quite fast.
Out of everything I worked with in the last 15 years I'd heartily recommend Rust for uber-performant-yet-mostly-easy-to-use language.
Out of everything I worked with in the last 15 years I'd heartily recommend Rust for uber-performant-yet-mostly-easy-to-use language.