[capableweb]

Most of the compared languages (except C#) are likely to lag behind Java on many things, performance included, since Java has been around since 1996, Golang only been around since 2009 and Rust 2010. More time = more engineering time to optimize.

[qalmakka]

While this _could_ be correct if we are just talking about Go, which has its own backend and optimizer, it is definitely not the case for Rust, which uses LLVM. The differences seen in these benchmarks are all about the gRPC implementation used; languages are irrelevant. C++, Rust, Go and Java all have their own standalone implementation written from scratch, so it's kind of an apples and oranges situation here. You can write good or crummy code in any language for what it's worth.

[capableweb]

I agree with you and I think we're both right here, on both measures :)

[paavohtl]

This comparison is more about the different gRPC implementations rather than the languages. There is no inherent reason why Java (as a language) should be faster than C++ or Rust in a benchmark like this. A lot of time and money have been spent optimizing Java (or HotSpot), but only because Java is really hard to optimize compared to GC-less low level languages.