Unfortunately the batteries-included runtime of Go effectively forecloses any really high performance server code that scales well to huge machines. What it offers is moderately good and that's all you'll ever get. A Go web server will work OK on 8 cores and it will only go a bit faster on 32 cores and not at all faster, possibly slower, on 256 cores. Meanwhile Java async programs are still scaling up. These results are apparent if you look at the gRPC multi-language benchmarks.

There's only one way to write a server in Go and that has pros and cons.