I find the simplest way to performance tune Go programs is to wait for the next release.
I wonder are people really using go where performance is bottlenecking on code (and not say network)?
I guess you meant outside of google? Google's logs analysis is often done in "Lingo" which stands for Logs In Go. I assure you that logs analysis is very CPU bound.
http://www.unofficialgoogledatascience.com/2015/12/replacing...