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Correction- from the comments:

"2X dynos contain twice the capacity. Memory and CPU shares. It's a new option to experiment with vertical scaling: you may get better performance from one 2X dyno than two 1X's. In that case you'll get more value. As explained in the post whether or not that's the case depends on the app. If you find that scaling 1X dynos works better, you are free to keep these instead."

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