Download Speed and Latency Test
Get a precise, real-time read of your speed with this simple test, it can measure the performance of your connection regardless of who is your current internet provider. The BroadbandNow team recommends consumers regularly check their internet's performance as it fluctuates regularly and can identify when you need service support or when your household's usage exceeds your current plan's capability
About Our XFINITY from Comcast Speed Test Tool
Whether XFINITY from Comcast is your internet provider or you use a different provider, the speed test below can show key statistics about your internet connection.
Note: This speed test can be used to test any internet provider, not just XFINITY from Comcast .
If your XFINITY from Comcast speed test result is lower than expected, try resetting your router or call XFINITY from Comcast customer service for additional assistance.
Use our speed test to assess the quality of your broadband connection whether you use Xfinity or another provider. The dials above will return results on download speed and upload throughput. These metrics are the main signs of broadband quality. As of October 2021, Xfinity’s national average download speed is 203.54 Mbps. Throughout their coverage footprint, the average latency on Xfinity Internet speed tests is -1ms. For context, terrestrial connections usually perform in the 5–70ms range. Satellite connections can be in the range of 500–800ms.
XFINITY from Comcast Internet Speed Data
Maximum Advertised Download Mbps
User Speed Test Download Mbps
Speed Tests from XFINITY from Comcast Customers
XFINITY from Comcast Fastest Download Speeds Over Time
XFINITY from Comcast Average Download Speeds Over Time
Top Cities For XFINITY from Comcast Internet Service
|Houston, TX||3,000 mbps||370 mbps|
|Chicago, IL||3,000 mbps||317 mbps|
|Miami, FL||3,000 mbps||321 mbps|
|Philadelphia, PA||3,000 mbps||454 mbps|
|Minneapolis, MN||3,000 mbps||426 mbps|
|San Jose, CA||3,000 mbps||467 mbps|
|Denver, CO||3,000 mbps||452 mbps|
|Atlanta, GA||3,000 mbps||429 mbps|
|Portland, OR||3,000 mbps||458 mbps|
|Seattle, WA||3,000 mbps||510 mbps|
Fastest Cities For XFINITY from Comcast Internet Service
|Hillside, IL||3,000 mbps||1,434 mbps|
|Merrimac, MA||3,000 mbps||936 mbps|
|Carver, MA||3,000 mbps||924 mbps|
|Nokesville, VA||3,000 mbps||924 mbps|
|Carlisle, MA||3,000 mbps||924 mbps|
Xfinity Speed Test FAQ
Xfinity speed test results shown above are based on thousands of real-world Comcast Xfinity connections. 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. This results in lower speed averages than you are likely to experience on a properly-installed Comcast Xfinity connection. To remedy this, the tables above show 90th percentile results in addition to raw Xfinity speed test averages. 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.
Why Are Xfinity’s Upload and Download Speeds Different?
Xfinity is a cable Internet provider, which means that their Internet service is provided over coaxial cable networks. These copper cable networks are older than the “fiber” networks, and have limited bandwidth compared to fiber-optic technology. 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.
Xfinity, like all cable Internet providers, chooses to prioritize download speeds for their customers because most users download much more content than they upload. 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. The only data going “up” will be the small requests you make while interacting with the Netflix interface, like pushing pause, selecting a film, fast forward, and etc.
Is Xfinity’s Latency Normal?
Our Xfinity speed test tool shown above includes latency measurement. Latency is how long it takes for data to make the round-trip journey from your home network to a server and back again. You can think of it as a measurement of “lag.” Latency matters most for gaming, video chat, and other real-time activities. Latency is not a major concern for regular activities like scrolling through Facebook or watching Hulu.
Xfinity speed test records we’ve analyzed show that their latency is similar to other cable providers, and is good enough for the vast majority of users. Only professional gamers are likely to have any issue with Xfinity’s latency performance.
What Speed Is Xfinity Performance Internet?
Xfinity’s “Performance” Internet service performs similarly to all other Xfinity plans in terms of how the “promised” or “advertised” speed compares to the delivered speed. In general, you can expect that the speed you get on a laptop when testing your connection over WiFi will be around 10–30% below the speed of your plan. This is normal — a variety of factors slow down the speed that reaches individual devices on a healthy home network, with signal fade in WiFi being the biggest issue. When running a speed test on an Xfinity Performance Internet plan, you’ll only get 100% of the speed if you plug directly into the router with ethernet. Wired connections are much faster, and it prioritizes the wired device over other “WiFi hog” devices in your home.
Xfinity Internet Speeds in Context
Overall, Comcast speed tests are comparable to other cable providers. Since launching their DOCSIS 3.1 update, they even outperform the average in many cities. Their network quality varies from area to area, so be sure to check results in your city. Search your zip code with our search tool at the top of this page to see local speed statistics.