I've run this multiple times.
Two PC's runningThe TBB Speed Test via a browser (tried both versions) compared with TBBMeters "Test Download, upload, and latency).
Virgin Media 30 Mbps on contract. Recently rebooted network & Pc's.
Speedtest : 14.3 Mbps (15.5 Burst) down, 1.9Mbps (2.1 Burst) up, 31ms latency
TBB Meter (graph): 36 Mbps Burst down, 2040.Kbps Burst up
The TBB Meter reading is not particularly toppy - u.e. the graph indicates an average/sustained speed of around 30Mbps