Can you explain how exactly did you test WiFi performance? I have Deco mesh with M9, if you can tell me how you tested, in more detail, I can share my experience.

@RG58 If you are only buying Deco mesh for WiFi coverage, configure them to run in Access Point mode. It'll keep your ISP provided router in play and you'll avoid a lot of headaches.

@richpriest To add to this: if I am not mistaken, it is not even web site pings but DNS queries.

@EMusch It appears you run your Deco mesh in Access Point mode. You won't have QoS settings in this mode, but instead Deco will deliver best performance. Have you tested your Internet speed using...

@NetworkPianist I would still recommend to disable 2.4GHz on Main Network. Deco mesh uses band steering to move idle devices to 2.4GHz. Which is where your smartphone will end, and won't be eager to...

@h1627 If you do not need content filtering features of Deco mesh, such as parental controls, QoS, etc. - just switch Deco to Access Point mode. Better yet - switch Deco to AP mode and see if any...