[estebank]

What I noticed is that you have a lot of tools available to tune Java applications, but it was more necessary to rely on them to get to a good spot. In the Rust version, I got a 2x speed improvement by using a rayon thread pool instead of tokio, but the improvements in the Java version were 100x by the end of it.

[vkazanov]

Java tooling in general is great, that's true.

But nothing beats Vtune for squeezing the lemon of a tight loop of C code beyond any reason :-) Java just doesn't lean itself well to that kind low-level code wrangling. One misstep - and the performance house of cards falls apart.