fix: increases DERP send queue length to 512 for increased throughput #54
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Increases DERP send queue length.
Testing in AWS reveals that a major bottleneck to throughput via DERP is the DERP server itself dropping packets. The queue is 32 packets by default, and even relatively modest speeds of ~50Mbit/s over a 10ms connection resulted in overflowing the queue and dropping packets.
Throughput tests in AWS show a marked increase in throughput with an increase to 512 packets.