Xfinity Speed Test Let's test the speed to your device We'll measure the speed from our servers to this device. Results are often lower than plan speeds due to WiFi conditions and device capabilities. It's important to differentiate between the speed of the Internet connection 'to your home' and the speed that reaches an individual device 'within your home' because they're two very different measurements. These test results are often lower than your plan speed due to various factors outside your Internet provider's control, including WiFi conditions and device capabilities. Good coverage means your device is getting a strong WiFi signal. That strong signal will also deliver as much speed as your device can handle. The placement of your Gateway is the key to ensuring both coverage and speed for your devices. Your home WiFi connection is only as good as your Gateway modem or routersince all devices connect through it. We upgrade our smartphones regularly, but often neglect to upgrade the actual devices that connect us to the Internet.