@Hermanator2 

Good day,

Thank you very much for your time and patience.

Could you please help me check the signal strength between the two satellite Decos with the main Deco to see if it is the location that caused the slow speed?

How much internet bandwidth you are supposed to get?

Would the Ethernet speed be slow as wireless connection?

Please make sure the QoS, parental control and antivirus have already been disabled;

If possible, please also try to switch to a different Deco and set up again to have a look;

Thanks a lot for your cooperation and support.