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Stopping by to say, 9ms API response time is just ridiculously quick. You're starting to run into the laws of physics and client proximity to the datacenter where those machines live. That's a pretty amazing feat. I would assume the next step for scaling is getting those read replicas deployed across the world in order to cut down on RTT.

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9ms 50%ile node latency is good, but that number is normally 1ms for big internet services. See https://dl.acm.org/cms/attachment/3658918e-7081-4676-beec-aa... Mission critical stuff goes even faster like BigTable which has numbers 4x better than the figure.

Why would they need to bother when it's mostly machines talking to machines? Certbot doesn't care that it took 90ms vs 9ms.

The 9ms is one indicator that the new hardware platform has ample extra capacity for future growth in load and traffic, it probably won't need to be replaced or upgraded for some years.

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