Comment by jcalvinowens

> In modern times, the bandwidth saved by Nagle is rarely worth the latency cost.

I actually took some packet dumps and did the math on this once, assuming any >=2 non-mtu-sized segments from the same flow within 10ms could have been combined (pretty conservative imo). The extra bandwidth cost of NODELAY amounted to just over 0.1% of the total AWS bandwidth bill, which, while negligible, was more than I expected.