OP, you could potentially leverage an existing benchmark suite: https://naruaway.github.io/valibot-benchmarks/
https://github.com/nimeshnayaju/valibot-benchmarks
I have included the results I obtained from running the benchmark in the README.md. I'd love for you to also take a look at the changed code to see if I may have missed something with the integration. Curious to hear your feedback too!
https://github.com/nimeshnayaju/zod (Fork of Zod's repo which already included benchmarks comparing Zod 4 against Zod 3, so I simply integrated my validation library)
https://github.com/nimeshnayaju/valibot-benchmarks (An unofficial benchmark suggested in another comment comparing Valibot against Zod)