> The latency to human user is what matters. Agreed, which is why the most surprising part of this article for me was this phrase: "In our main data center ser

> The latency to human user is what matters. Agreed, which is why the most surprising part of this article for me was this phrase: "In our main data center serving non-China traffic". The transit latency to the one main datacenter in the (non-China) world is a lot more significant than the server time here. (Over 50 ms just to cross the US; compare with their server-side latency numbers of 95%ile < 5 ms, 99%ile < 50 ms.) If they're serious about latency, their deployment is holding them back much more than their choice of programming language or algorithm. Or maybe the client is not the user's phone, but some other service running within the same datacenter?