I was curious so I downloaded Go 1.4, and tested against 1.9 on an old version of a project I have (backend for Mafia Watch), about 30K lines of Go, including a

I was curious so I downloaded Go 1.4, and tested against 1.9 on an old version of a project I have (backend for Mafia Watch), about 30K lines of Go, including a few 3rd party dependencies. Go 1.4: Around 2.1s Go 1.9: Around 2.5s So within 20% of 1.4, not bad. That's on an old MacBook Air, dual core 1.7 GHz i7, 8GB ram. And of course the binary performance and GC pause times w/ 1.9 will be much better. Here's the raw times: https://pastebin.com/ULDHPmVu https://pastebin.com/ULDHPmVu Two awesome things: It was super-easy and fast to download and compile Go 1.4 It was completely painless to compile my old code with Go 1.9 I fucking love how nice it is to work with the Go ecosystem. <3