Cable Internet provider Comcast's XFINITY brand has a great tool for checking your connectivity to one of its many servers across America. You can test connect speed to Atlanta, Boston, Seattle, Denver, Pittsburgh, Houston, Miami and more! Just slide around to pick the server of your choice and Comcast will first check your latency and then begin analyzing your average and peak download & upload speeds. You can even use the "Copy URL" feature to share your results to rub it in or get your friends to laugh at you, all depending upon the outcome.
Comcast Speed Test Page
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