[jashmatthews]

10x faster in, say, Go? Are you sure? Have you benchmarked it? You might be surprised.

Lets pick a weakness of Ruby: tight loops and lots of math. Take 16,000 GPS points and calculate the geographical distance to another point.

On my machine it takes 12-14ms in Ruby and 4-6ms in Go. That's only a little bit more than twice as fast! Almost certainy not worth re-writing your entire app for.

I've worked with a bunch of large, legacy Rails apps. In between a couple of Rails jobs, I worked on a large .NET app, which didn't have much better performance. One service I helped migrate from Rails to Spring/Java for an enterprisey client actually got slower overall, despite moving to the JVM.