SQS, Simple Message Queue, is a message-queue-as-a-service offering from Amazon Web Services. It supports only a handful of messaging operations, far from the complexity of e.g. AMQP, but thanks to the easy to understand interfaces, and the as-a-service nature, it is very useful in a number of situations. But how fast is SQS? How does it scale? Is it useful only for low-volume messaging, or can it