54Mbs is a Wi-Fi card speed not a Network Interface Card (NIC) speed.
To keep it simple, can you select a device , preferably quite new that you can connect an ethernet cable to and then connect it to your Hub.
What is the connection speed of that device in the Hub > Connected Devices list ?
Now do do a speed test at >> speedtest.net << using that device, what speed do you get ?
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BT Smart Hub 2 with 70Mbs Download,18Mbs Upload, 9.17ms Latency & 0.35ms Jitter.