[Q](https://github.com/kriskowal/q) is very slow and eats so much memory compared to alternative Promises libraries as shown [here](https://github.com/petkaantonov/bluebird/tree/master/benchmark). Consider switching to [Bluebird](https://github.com/petkaantonov/bluebird) or something else to squeeze out performance for `react-packager`.