A user is 150 ms (round trip) from your only data center. Over a new connection (TCP plus TLS 1.3), how long until the response to the first request arrives, ignoring server time?

Answer

About 450 ms. In review, anything from 300 to 675 counts as right.

The worked estimate

TCP handshake: 1 round trip. TLS 1.3 handshake: 1 round trip. The request and its response: 1 round trip. 3 × 150 ms = 450 ms. Terminating connections at a nearby edge and reusing connections removes most of it.

Numbers: Numbers to know.

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