A couple of informal tests
Note, none of this is necessarily idiomatic for each language, or even representative of best practices…but it does represent the results of a “how far can I get in less than 2min of googling…” style research ;)
Golang: ~80ms (~70ms when compiled)
Again, none of this was a controlled, scientific study of performance. Each test was run a few times and a rough median was drummed up.
Node and Dart seemed to have similar latencies, with golang being quite speedy comparably.