> Grab’s engineering team went from 18 minutes for go get to 12 seconds after deploying a module proxy. That’s not a typo. Eighteen minutes down to twelve seconds.

> The problem was that go get needed to fetch each dependency’s source code just to read its go.mod file and resolve transitive dependencies. Cloning entire repositories to get a single file.

I have also had inconsistent performance with go get. Never enough to look closely at it. I wonder if I was running into the same issue?