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We were seeing many repeated builds while running the app locally. When
we started seeing repeated builds while running tests, that was the
final straw. After some investigation, we ended up at the EmberCli Rails
gem as the culprit.
It was recently discovered that the
ember-cli-uglify
addon was causinglots of duplicated work to be done.
More details can be found in the original issue:
github.com/tricknotes/ember-cli-rails/issues/184
The EmberCli Rails README has even been updated to advise this:
github.com/rwz/ember-cli-rails#experiencing-slow-builddeploy-times
This has reduced the local build time from 40+ seconds to 12 seconds.
We no longer see duplicate builds happening. Watchman no longer throws
many thousands of errors about recrawling the tree.