[Cryptography] Cycles overhead for TLS

[Ryan Carboni]

>
> To over-simplify: CPU costs are not a factor; network latencies and round-trips are the only thing that matters.  QUIC and TLS 1.3 will do zero-round-trip setup if you’ve already been to a site.
>
>
Average webpage 2 MB. Average US internet speed is ~12 Mbps.
Time to download the webpage: 1.3 seconds if you're sitting on top of the
server.

"1.0 second is about the limit for the user's flow of thought to stay
uninterrupted, even though the user will notice the delay. Normally, no
special feedback is necessary during delays of more than 0.1 but less than
1.0 second, but the user does lose the feeling of operating directly on the
data."

http://www.nngroup.com/articles/response-times-3-important-limits/
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