Zlib-rs is faster than C

"faster than C" almost always boils down to different designs, implementations, algorithms, etc.

Perhaps it is faster than already-existing implementations, sure, but not "faster than C", and it is odd to make such claims.

The fact that it's faster than the C implementation that surely had more time and effort put into it doesn't look good for C here.

It says absolutely nothing about the programming language though.

How can it not? Experts in C taking longer to make a slower and less safe implementation than experts in Rust? It's not conclusive but it most certainly says something about the language.