> Mosquitto was compiled with gcc 4.8.2, the Go implementation was executed with go run, the D implementation was compiled with dmd 2.0.64.2 and the Erlang version I’m not sure.
The "I'm not sure" speaks for itself, but go run also includes both compilation time and execution time and they're comparing it against just the execution times of the other languages. That's not exactly an apples to apples comparison.