Use multi core to speed up building os.osx.x86 webpack?

Since installing webpack my build times are much longer when working on API changes. I also notice that every time meteor builds it only uses 1 of my cpu cores. I’ve done a little research and come across this package https://www.npmjs.com/package/parallel-transpile but I’m not sure how to integrate into my app. I’m using
meteor add webpack:webpack and webpack:react.

If someone has done this already I’d appreciate your aid, thanks!

Asking over on Stack Overflow => http://stackoverflow.com/questions/37778227/use-multi-core-to-speed-up-building-os-osx-x86-webpack

Someone on stack proposed parallel-webpack which makes sense as the solution, but I’m not sure how to config it with the meteor webpack package => https://github.com/thereactivestack/meteor-webpack/tree/master/packages/webpack/