Xfinity Speed Test Review Cons. The main disadvantage to Xfinity’s speed test is the fact that it does not run on a secure connection. Some more minor complaints include the inability to save your test history, as well as the rather limited information regarding the IP address used for testing. Increase Internet Speed - How to Optimize Your - AT&T Xfinity Speed Test Operating in 40 states and servicing over 40% of the US, Comcast (Xfinity) is the United States largest cable operator. With over 25 million internet customers as of April 2017.

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