@AmrS
Welcome to the community.
Thank you very much for your patience.
Can I have more details about the speed test result from the main Deco and satellite Deco?
How far is satellite X60 from the main X60?--can I have a picture of the signal source on the satellite Deco?
Are you able to find a wired laptop and connect it to the satellite X60 to test the wired speed?
Normally the speed from satellite Deco would be less than the speed from the main unit but less than 10% is quite unexpected:
Why is my satellite Deco unit not getting the same speed as the main Deco?
Best regards.
--------------------------
Deco X50-PoE is ready for your advice. If you are interested, please help us complete the following survey.
Deco X50-POE Survey