RustPython is just an interpreter written in Rust. There's no reason why it would be meaningfully faster than CPython just because it's written in Rust rather than C. Rust adds memory safety, not necessarily speed.

A new and immature interpreter is going to have other problems:

- Lack of compatibility with CPython - Not up to date with latest version features - Incompatibility with CPython extensions

RustPython is a cool project, but it's not reached the big time yet.