There is a massive improvement in QUIC connections with this enhancement. With relays disabled, remote connections appear in several seconds instead of 10 x minutes. Throughput also seems to be greatly improved.
Great job devs!
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Oops, should be #7636
Just some tweaks to the UDP holepunching to go and syncthing should be able to use fast p2p connections without relays or firewall interaction in most scenarios 
Nice. Glad to see this.