For example, when using Netflix to stream a film, most of the transmission of data is going from Netflix’s server down to your home network. Xfinity, like all cable Internet providers, chooses to prioritize download speeds for their customers because most users download much more content than they upload. Even using the latest DOCSIS 3.1 transmission technology, the upload speed of Xfinity speed tests will almost always be significantly lower than the download speed. These copper cable networks are older than the “fiber” networks, and have limited bandwidth compared to fiber-optic technology. Xfinity is a cable Internet provider, which means that their Internet service is provided over coaxial cable networks. Why Are Xfinity’s Upload and Download Speeds Different? 90th percentile results remove the lowest tests, which are commonly the result of test error, to provide a higher average that more closely mirrors the actual experience of Xfinity connections we’ve tested. To remedy this, the tables above show 90th percentile results in addition to raw Xfinity speed test averages.
This results in lower speed averages than you are likely to experience on a properly-installed Comcast Xfinity connection. Keep in mind that these test results are run by actual users, not technicians or IT experts - because of this, our Xfinity speed test results often include home networking issues caused by user error. Xfinity speed test results shown above are based on thousands of real-world Comcast Xfinity connections.
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