Without digging into the code but would a limit delay ACKs?
@terry just check which kind of connection is established. Anyway Windows properly displays TCP/UDP network usage. No magic here.
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So you say, but I see nothing that indicates this. You seem to be assuming that because your download rate is reduced by 43 Mbps that means Syncthing is downloading 43 Mbps. That’s not the case, because a much smaller amount of uploads can reduce your downloads significantly, just by blocking outgoing ACKs etc., especially on asymmetric internet connections and tech like DSL or cable.
Also there is no “hidden” traffic here. What Syncthing generates is visible in the UI: those counters cover all protocol transmissions and receives. Similarly you’ll see correct (but different, because they look at a different layer) measurements in task manager / activity monitor.
That you’re not seeing traffic in these places doesn’t mean the traffic is somehow magically hidden, it means the traffic isn’t there to begin with.
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