The fastest speed available from Xfinity is 2000 Mbps.
 

The Xfinity Speed Test is accurate, but given the number of variables that can affect your Internet speed at any given time, we recommend running several tests at different times of day to get a more accurate measure of your average speeds.
 

Yes; they are different names used for the same test. The Xfinity xFi Speed Test, also known as the Comcast Speed Test, is used to calculate the available Internet bandwidth at your location.

Yes. The Comcast Speed Test is a universal speed test that will measure your speeds no matter your Internet provider.
 

The results you can expect from your speed test will largely depend on the speeds outlined in your Internet package. If your download and/or upload speeds consistently fall below this range, there are a number of steps you can take to troubleshoot the issue, outlined below.
 

If you are consistently experiencing WiFi speeds below the range outlined in your package, there are a number of steps you can take to try improving your speed. These include: rebooting your router and modem; ensuring the problem isn’t isolated to one website; minimizing the number of devices and applications running simultaneously to measure the impact; relocating your router to a more open location. If these options do not solve for your speed concerns, you may want to consider investing in a WiFi extender.