Can you carry out a couple of speed tests at speedtest.net using a direct connection using a Cat 5E/6 cable between the Hub and a 1Gbs capable Pc/Mac/Chromebook and no other devices connected.
Ensure that the Network Interface Card (NIC) drivers are up to date.
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BT Smart Hub 2 with 70Mbs Download,18Mbs Upload, 9.17ms Latency & 0.35ms Jitter.