How do you get that C# is way behind Go on this one? If anything, those benchmarks show these groups of languages performing at roughly the same level:
1. C/Rust
2. Go/C#
3. Java/OCaml/Haskell
4. JavaScript/Swift
5. Python
1. C/Rust
2. Go/C#
3. Java/OCaml/Haskell
4. JavaScript/Swift
5. Python
And depending on how you draw the picture, Go might not even be in the bandwidth picture.