The first golang result in the plaintext benchmark ranks 8th (atreugo-prefork), which is incidentally immediately followed by firenio-http-lite, a Java library.
My point still stands, this is a third party library that is not commonly used, and depends on another third party library, fasthttp, which itself comes with caveats from the its author.
Doesn't matter, it's still Go code, and contrary to many languages on that benchmark ( Java included ) all Go code is built in Go, so there is no runtime / external library written in C/C++. ( one of the reason why Go is also slow on the regex benchmarks )
My point still stands, this is a third party library that is not commonly used, and depends on another third party library, fasthttp, which itself comes with caveats from the its author.