Is throughput on higher bandwidth networks hindered by smaller UDP packet size?

As you are using a wireless network sending longer packets naturally takes longer time and hence the probability of radio interference is higher which causes more retransmissions reducing the effective bandwidth. The optimal packet size in a wireless network is probably dependent on the amount of noise in the area.

Assuming IPv4, there is a 28 byte overhead on UDP packets, i.e. The real IP packet size is UDP payload size + 28. So for example if you are sending 56 byte packets the overhead is 100%.

If you are sending 280 byte packets it is 10%. So the throughput goes up.

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