Earlier quoted context omitted.
Are you seeing 10 second rebuilds with incremental builds? Or is this 10 seconds for a complete rebuild?
With incremental builds. I have forked this project: https://github.com/wekan/wekan (~ medium size). On a 2014 macbook pro, reloading after a change in a template takes 10s. Not a dealbreaker, but this is frustrating. And this is with meteor 1.2. The slow build times may be due to the wierd frontend preprocessors (jade and stylus), but still.
Still 5s is far from ideal considering the development experience with webpack and React hot loader.