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.

Nevertheless Russinovich actually says something in the lines of "simple rewriting in rust made some our code 5-15% faster (without deliberate optimizations)": https://www.youtube.com/watch?v=1VgptLwP588&t=351s

I’m sure I’m missing context, and presumably there are other benefits, but 5-15% improvement is such a small step to justify rewriting codebases.

I also wonder how much of an improvement you’d get by just asking for a “simple rewrite” in the existing language. I suspect there are often performance improvements to be had with simple changes in the existing language