@ARGamingPK1 

Hi, Would there be a lot of smart home devices in the Mesh network of Deco X20?

Have you checked whether Archer C6 used the same 2.4GHz channel as Deco X20?

I think for Deco, the 2.4GHz band is not only for mobile devices, also used for 2.4GHz wireless Backhaul among Decos.

Moreover, I see the Redmi Note 11 phone is only WiFi 5, even though the 2.4GHz of Deco X20 is WiFi 6(up to 574m/s). Due to the spec limitation of the Redmi Note 11 phone, its maximum 2.4GHz link speed would be similar to Archer C5.

Thank you very much and best regards.

  @David-TP Yeah many IoT devices are connected on Deco X20

  @David-TP Archer C6 is running on 20 MHz and Deco is on 40 MHz that's why Deco 2.4 GHz wifi is congested and slow.