Everything you wrote is true, but I think you're overstating the performance cost of Go design and implementation choices. I think the parent comment is fair in

Everything you wrote is true, but I think you're overstating the performance cost of Go design and implementation choices. I think the parent comment is fair in saying that Go is somewhere between GCC and the JVM in terms of performance. But I agree that Go is not designed for extreme performance (the kind of software where even a 1% gain matters), and that C/C++/Rust are better for these purpose.