You're right. I think I got ahead of myself in what I was thinking, conflating the rewrite of the C++ system into Go with the some of the other speedups I've been reading about coming from other languages/frameworks.

I'd be interested to know more from Matt about speedups or slowdowns in specific subsystems that are feature-for-feature complete (as opposed to comparisons of Go to C++ where the Go rewrite is simply doing less stuff because lots of cruft was tossed out).