sync speed slow with quic wan

We are using the latest version of SyncTrayzor with syncthing 1.23.2. The sync speed is normal(about 70MB/S) within the same subnet.(quic lan)

However the sync speed is extremely slow(about 1.6MB/S) when sync with the workstation in another city.(quic wan).

None of them use a relay server

We tested the udp speed with iperf bandwidth 100M,result as below.

Have no idea what casued this, please advise

image

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Could you switch to tcp and see if that improves the performance?

The iperf results show a pretty significant packet loss of 22%. Try lowering the bitrate until it’s consistently at, or close to, 0% and also test in both directions. The resulting bitrate will be what you can expect to realistically get rather than the raw burst speed.

10.0.52.117 is on a private subnet range, so is there a VPN between the two Syncthing endpoints? What type of link is it?

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