[jbergens]

But a change of language might bring you more tools, for example to handle thread-pools or process pools (service worker pools). Some of these things might be much easier to do in Go (or Java or C#) than in Ruby and if that part was a reason the new version works better the language change did help. I am no saying it was impossible to improve performance with Ruby but they might believe it was easier with Go. I still think a monolith app can be more performant than micro services in a lot of situations but you might have to use things like thread pools/channels.