![]() We get useful engineering information out of truthful results. It's also unknown how the other speed test servers are managed, what their capacity is, etc etc.Ĭould they be gaming the speed test results on their domain? It's possible to see wildly different results from different servers at different times of day, simply because the paths between Comcast and wherever they are hosted may or may not be congested. Once you test to an off-net speed test server, you are bringing the internet into the equation and the reliability of the speed test drops. We can then eliminate several pieces of Comcast infrastructure from the puzzle of slow speeds on the customer side. So if you have a good speed test on one of our servers, it means that your provisioned speed is being provided within the Comcast network, and we have to look a bit further out to find a speed bottleneck. This keeps the speed test close to your local CMTS, so that we can have an end-to-end picture inside the network of where slowdowns may be occurring. When you're on a Comcast connection and test to a Comcast speed test server (or a server hosted on Comcast), you are staying within the Comcast network backbone and not crossing onto the internet. They both run the Ookla speed test software. We host two types of severs on the Comcast network. I'm on the team that manages our speed test infrastructure. And 's results are consistently way higher than most other sites, which makes me even more suspicious of its accuracy.Ĭomcast employee here. Internet speed tests, like this one or the test found at, measure the latter, or the speed reaching the device running the test. I know it's natural for speeds to fluctuate, but the fluctuations I'm getting are massive.like from 90/down at it's best, to 5-10/down at its worst. erratic and nothing came close to what I should be getting.Īt any rate, the fact that Comcast's official speed test site only allows me to choose from 1 server just further raises my suspicion. ![]() Customers can access the tool by visiting the Xfinity website and clicking on the. So I did try a few different servers on the sites that allowed it. One of the key benefits of Xfinity Speed Check is that it is easy to use. As for your first question - I'm not sure I completely understand what you mean, but of the three Ookla-run sites, lets you pick different servers (but says it will automatically check the best one for you), doesn't even let you pick your server (it offers 1 to choose 's in San Jose I'm in San Francisco), and only offers 3 servers to choose from on the West Coast - Seattle, San Francisco, and L.A. The speed test then measures your download and upload speeds. That measurement, recorded in milliseconds (ms), is your latency. To do this, it sends a small amount of data from your device to the nearest test server and measures how long it takes to receive a response. Ok, so I'm back and trying to reply to comments, for anybody that's still around. Xfinity speed test results will vary by time of day, connection type and number of other connected devices. How does the Xfinity internet speed test work Our speed test starts by measuring your connection’s latency. ![]()
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