I don't think I have ever seen a benchmark that concludes this. I think the best conclusion is that Go, C# and Java perform roughly the same - which makes sense

I don't think I have ever seen a benchmark that concludes this. I think the best conclusion is that Go, C# and Java perform roughly the same - which makes sense since they are basically all the same thing. As you say, you could write a Go version which would be equally fast. Here is another showing Go under-performing both Java and C# by a bit. Benchmarks may not be perfect but better than conjecture. https://www.techempower.com/benchmarks/#section=data-r21 https://www.techempower.com/benchmarks/#section=data-r21