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initial build (due to babel / jshint /HTMLBars) is slow #4645
the focus has been large re-build time, as such the caches are lost between rebuilds.
To mitigate this I created https://github.com/stefanpenner/broccoli-persistent-filter work works quite well, but still needs windows support fixed.
In one of our large ember apps, this took the babel time down from (initial build) 60s -> 2-3s.
Once we can persist this caches, we will likely make babel non-optional (yes with opt-out support for our CoffeeScript fans)