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The _histogram cache in the frames objects was never hit, because of the way promises are scheduled.
Solved by making the
getHistogram()
method synchronous.Before:
![screen shot 2016-04-24 at 15 08 40](https://cloud.githubusercontent.com/assets/2567083/14767789/97d8baf0-0a2e-11e6-93b9-cf77ee550d7a.png)
![screen shot 2016-04-24 at 15 08 28](https://cloud.githubusercontent.com/assets/2567083/14767791/a0647894-0a2e-11e6-90cc-cf6639a968f6.png)
After: