The amount of memory used depends on your application. There is no reason to queue UDP datagrams unless you don't get them as they come.
port ? layer-2 driver ?
data size ?
stats ?
frames per second ?
memory usage ?
app details ?
If you are expecting high-performance, you should be using RAW API, and so each received frame carrying a UDP datagram would trigger a callback to your application receive function; if your port and driver are not buggy ;^)

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