If you have a hundred million integers to add, please, by all means, use Rust, or C, and intrinsics for the features not yet in your favorite math libraries. You can call Rust from Python, for instance. Polars is excellent, BTW. This seamless integration between a nice language amenable to interactive experimentation and highly optimized code produced in many other languages I don't want to write code in is what makes Python an excellent choice in many business cases.