@Prakarhta The feature you're refering has to be implemented in the router FW to be available for use. This router is meant to be distributed by ISPs and there's a slight chance implementing such a...

@HughCF Check your WAN port speed - it should be 1000mbps: Disable any QoS services if enabled on the router - restart the router and test again.

@IREWolfman Check this post regarding your request.

@doobre It should be like about 30 devices, both wired and wireless (in total).

@ali_ahmed Try to enable this feature from Advanced Setup mennu in Wireless settings:

@SSSK Set the Deco X20s in AP mode and try again.