I have new 2.5 GB Broadand service installed by Hong Kong Telcom

But my desktop which run on Win 11 only 975 Mbps for both updload and download when connecting to Deco XE 75 Pro router. 

If I directly connect HKT wireless mdoem to my desktop, it can have 2348 Mbps in download and 1535 Mbps in upload.

Please advise how to fix this issue.

Even for my Wifi 6E connection in both desktop and laptop, it can has over 1050Mbps  for both download and upload. Seems it is slow.

As  Deco XE 75 Pro is 2 pack, the router which is away from my main one, the speed is even slow, only 200 to 300 Mbps in speed through Wifi 6E connection.

Please advise how to configure this Deco XE 75 Pro is 2 pack so that the speed back to normal. 

Thanks.

Ivan