I noticed this, too. This statement stood out to me in particular: > Our main shard cluster involves 12 Quadruple Extra-Large memory instances… We’ve found tha

I noticed this, too. This statement stood out to me in particular: > Our main shard cluster involves 12 Quadruple Extra-Large memory instances… We’ve found that Amazon’s network disk system (EBS) doesn’t support enough disk seeks per second, so having all of our working set in memory is extremely important.