This is only because the Rust implementations are using particularly slow code paths, either because SIMD/AVX optimizations requires a nightly compiler, some optimizations would require unsafe code, or that other languages are using particularly hacky code that would never fly in real world software.

For example, many of the Java/C/C++ benchmarks are using custom optimizations that should be illegal for the benchmarking. Case in point, some are featuring custom hash maps that feature hashing algorithms that, while fast, would never be useful as they provide no protection against collisions. You'll see a hashing algorithm in a C preprocessor, for example, that just fakes having an actual algorithm whereas Rust examples are sticking to the tried and tested production-grade algorithms shipping in the standard library.