Make sure the cable is Cat 5e or better and make sure your PC/laptop has a 1Gbps or better network card.
To check your PC is running 1Gbps or better and assuming you are using windows 10 can you type in "View network connections" in your search bar bottom left, then right click your Ethernet connection and select "Status" What does it say for speed? Should read 1Gbps or better?
Make sure you have just a single Cat 5 e or better Ethernet cable connected to the Hub via PC, no switches or powerline adapters etc.
Also go into your router settings and check under connected devices that the PC is connected at 1000mb.
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BT Full Fibre 900 FTTP - Asus RT-AX82U to Openreach ONT Box & Asus RT-AX56U with AiMesh setup
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