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Throughput improves substantially when measured via netstack loopback (TS_DEBUG_NETSTACK_LOOPBACK_PORT). Before (d21ebc2): jwhited@i5-12400-2:~$ iperf3 -V -c 100.100.100.100 Starting Test: protocol: TCP, 1 streams, 131072 byte blocks Test Complete. Summary Results: [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 5.77 GBytes 4.95 Gbits/sec 0 sender [ 5] 0.00-10.01 sec 5.77 GBytes 4.95 Gbits/sec receiver After: jwhited@i5-12400-2:~$ iperf3 -V -c 100.100.100.100 Starting Test: protocol: TCP, 1 streams, 131072 byte blocks Test Complete. Summary Results: [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 12.7 GBytes 10.9 Gbits/sec 0 sender [ 5] 0.00-10.00 sec 12.7 GBytes 10.9 Gbits/sec receiver Updates tailscale/corp#22754 Signed-off-by: Jordan Whited <jordan@tailscale.com>