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Interesting.. QUIC isn't very quick over fast internet.
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They’re in Section 6:
Receiver should adopt UDP GRO. (Something about saving CPU processing UDP packets; I’m a but fuzzy about it.) And they have suggestions for making GRO more useful for QUIC.
Some other receiver-side suggestions: “sending delayed QUICK ACKs”; “using recvmsg to read multiple UDF packets in a single system call”.
Use multiple threads when receiving large files.