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What specific piece saw the biggest boost? My guess is MongoDB. Also if new servers take 1-2 hours, you are always paying for what you "think" will be capacity for peak load correct? How do you handle events that quickly and drastically increase load or txn/sec?

Actually, it depends. Stability and performance wise, I'd say our Lucene-based search layer has seen the most impressive jump. But yeah, Mongo instances loved the new fast IO as well :-)

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