It looks like there's a bug in how the runtime is timed for Go submissions. Every submission shows a total runtime of 0ms. I mean, I know Go is fast but it's not that fast. Checking the submission details shows that every single submission is getting a runtime of 0ms.

I saw this most recently with question 1222. I can't really remember if I've seen it working correctly in the past, but I've definitely seen it on at least 2 or 3 other problems before.