I think he means C++ is 2x to 5x faster to run than Go. I saw many benchmarks and not sure if that is true though. Go is still one of the fastest out there.
That is already pretty fast, and I guess the difference in practical scenarios would be even smaller since external systems like DB's won't change their speed if you call them with another programming language and because production code is not always as optimized as benchmark code.
https://benchmarksgame-team.pages.debian.net/benchmarksgame/...
That is already pretty fast, and I guess the difference in practical scenarios would be even smaller since external systems like DB's won't change their speed if you call them with another programming language and because production code is not always as optimized as benchmark code.