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  • Send the same packet 15 times by UDP? You can't really get lower latency than that. Commented Jul 2, 2020 at 13:59
  • 15 times? You mean to make it super reliable or something? Commented Jul 2, 2020 at 18:27
  • 15 might be overkill, but just in case one of them gets randomly dropped. That's the lowest latency you'll get. Everything else involves waiting for a round trip, and some protocols need several round trips. Commented Jul 2, 2020 at 18:28
  • And then you can detect whether the server actually got the message, and retry if it didn't, but at that point, your lowest possible latency goal has been completely destroyed because you had to wait for a timeout. Commented Jul 2, 2020 at 18:30
  • @user253751 that misses the reliability part. Every sent packet is indenpend. You still have no way to ensure it got there. Commented Jul 7, 2020 at 19:22