A:Answer If you have an existing WiFi mesh system from Spectrum, it would depend on whether you want to continue using that system as your primary WiFi gateway, or switch entirely to the Deco as your primary WiFi gateway. If the former, you would want to set up the Deco in Access Point Mode and connect it to your existing network via Ethernet. If the latter, you would want to set up the Deco in Router Mode and remove your existing Mesh WiFi router system.
Your Internet speed is primarily dependent upon your Internet provider and subscription. Your WiFi speed (in comparison to your existing WiFi mesh system) will depend on the specifications/WiFi speed capabilities of your existing Mesh setup, the physical layout of your home, and where each Deco node is placed.