I prototyped this idea by manually adding a "mod" go-import meta tag to one module, to see if it'd make any difference. It turns out to be a massive win!
— Dmitri Shuralyov (@dmitshur) May 4, 2019
Before: each request was resulting in a full git clone.
After: it's serving just two tiny static .info and .mod files. pic.twitter.com/dS5KnTqwpk