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Having been part of their efforts to test 2X, and 4X Dynos and using Unicorn long before the RapGenius issue I can tell you the added memory and Unicorn still has issues. We still see periods where queueing is above 500ms. The additional Dyno capacity distributes the chance of queue issues out over a larger numerical set but there is still the possibility of one dyno/Unicorn worker combo getting too much to handle. We use Unicorn Worker Killer to help in that case.

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