just tried shapeprober (thanks for suggestion) but not sure I can interpret results. Standard speedtests usually show about 20 Mbps down and about 3-4 up, but I got this
Upstream: 3084 Kbps.
Downstream: 21124 Kbps.
The measurement will last for about 2.5 minutes. Please wait.
Checking for traffic shapers:
Upstream: Burst size: 4938-4973 KB; Shaping rate: 2128 Kbps.
Downstream: Burst size: 9408-9689 KB; Shaping rate: 12768 Kbps.
Seems pretty clear that the speedtest.net results are just getting the initial boosted rate, which seems to match "capacity", but Im unclear about the burst size and shaping rate stats. Can someone give me a quick interpretation (I assume it's not good news