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YJIT benchmarks can be found at https://speed.yjit.org/

The Rust port doesn't change performance much according to the pull request description.

I didn't know this was public, sweet! Nice that the tooling that generates this report is also published: https://github.com/Shopify/yjit-metrics

Your own link states --

Overall YJIT is 33.4% faster than interpreted CRuby! On Railsbench specifically, YJIT is 32.4% faster than CRuby!

Yes, but YJIT in rust is the same ~33.4% faster than vanilla CRuby than YJIT in C. The rewrite into Rust is expected to make YJIT easier to maintain and that may in turn make possible further improvements to code generation, but the rewrite generates the same machine code (and therefore the same speedup) as before.

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