I always wonder about people that need a extreme fast feedback cycle. I mean most of the time I do things, I actually think about new code, watch a side project, discuss in gitter.

Our code's full test suite takes longer than 10 minutes and I still feel pretty productive when working at it. Actually we lint/transpile our JavaScript with Google Closure which is faster than webpack, but it still takes over 5 seconds which is more than our scala app takes in continous compile? Also I always see these cool JavaScript people, but I've never seen any real world app that still has a amazingly fast micro seconds cycle.