[vbezhenar]

You can't easily improve the latency. My latency to EU is 100 ms, my latency to US is 250 ms, so request-answer is 500 ms. Make two request-answer cycles and that's already 1 second. And TCP already have some cycles. Yes, I have 100 megabits (which is not easy to utilize, because of TCP algorithm), but that does not help. And that's not only about size.

[def_true_false]

The number reported by tools like ping is round trip time -- it already includes the return trip.