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Xfinity Speed Test Results: How Did Comcast’s Home Internet Service Fare?

CNET explores the most recent speed test data from Ookla. What does it say about the nation's biggest cable internet provider?

Trey Paul Senior Editor
Trey Paul is a CNET senior editor covering broadband. His 20+ years of experience as a writer and editor include time at CNET's sister site, Allconnect, and working with clients like Yahoo!, Google, The New York Times and Choice Hotels. An avid movie fan, Trey's career also includes being a film and TV critic while pursuing a degree in New York.
Expertise Home internet and broadband, including plans, providers, internet speeds and connection types. Movies and film studies. Credentials
  • Master's degree in Cinema Studies from NYU and interviews with Conan O'Brien, Stan Lee and some of his biggest Star Trek childhood idols
Trey Paul
5 min read
Xfinity logo on a phone
James Martin/CNET

Our internet connections have increasingly become the lifeblood of our households. Whether you're working from home, taking extra online courses, streaming your favorite TV shows or updating your place with all the best smart home devices, your internet service provider is almost as important as your gas, water and electricity suppliers. What's one of the best ways to ensure your ISP delivers on its promises? Run a speed test.

A speed test will give you a snapshot of the megabits-per-second download and upload speeds you're getting from your provider. There are several good internet speed tests out there. If you're a Comcast Xfinity customer, in particular, Xfinity boasts its own speed test, available at Speedtest.Xfinity.com. But as I delve more specifically into Xfinity speed test results, this page will largely reflect data from Speedtest.net. It's the tool from Ookla, which quarterly publishes the results gathered from millions of customer uses of its speed test. 

Where did Xfinity place among the top US internet providers?

For the fourth quarter of 2023, Xfinity found itself in fourth place, behind Cox, Spectrum and AT&T, among the country's biggest ISPs. It had a median download speed of approximately 239 megabits per second.

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Fastest internet providers in the US

ProviderMedian download speed
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AT&T Internet
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Show more (2 items)

To qualify as one of the country's top internet providers, an ISP must appear in 3% or more of the total test data taken during the three months. For example, Ziply Fiber, a provider that services the Northwest, boasts the country's fastest residential internet plan at 50 gigabits per second. But since it's only available in that portion of the country, it won't show up on the national list (though it certainly registered in the state of Washington).

Also of note is that the 3% threshold is based on the data taken from tests run by customers across the country, not simply whether a provider covers 3% of the country. T-Mobile Home Internet, for example, is now available to 70% of the country, according to the Federal Communications Commission's National Broadband Map. However, its customer base, which has grown to approximately 5 million subscribers, was not quite large enough for it to crack into consideration on that top list.

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Chart showing the difference between median and mean

Ookla speed test info doesn't use its dataset's average (or mean) but the median, aiming to better represent the typical customer's experience.


Does every Xfinity customer get 236Mbps?

Though Xfinity speed test results with Ookla garnered a median download speed rating of 236Mbps, that doesn't equate to every Xfinity subscriber getting at least 236Mbps. However, it does show that most Xfinity customers will have a consistent internet experience. Ookla has a "Consistency" ranking -- which shows the percentage of results registered above broadband speed (based on the FCC's old 25Mbps download and 3Mbps upload, not the more recent designation of 100/20) -- and Xfinity landed near the top of that chart, with a 91.7% rating.

That can also be combined with the FCC's recent findings that over 90% of participants experienced actual median download speeds of at least 95% of the ISP's advertised download speed. That's certainly another good way to determine consistency for the customer. But what are the advertised speeds offered by Xfinity?

Available Xfinity internet speeds

Most ISPs offer three to five different speed tiers, but Xfinity is unique in that it boasts seven to eight different internet speed options, depending on your location. That's quite a bit more choice for customers than one normally encounters.

Xfinity speed tiers

PlanMax speeds
Connect 150Mbps download, 10Mbps upload
Connect More 300Mbps download, 10Mbps upload
Fast 500Mbps download, 10Mbps upload
Superfast 800Mbps download, 20Mbps upload
Gigabit 1,000Mbps download, 20Mbps upload
Gigabit Extra 1,200Mbps download, 35Mbps upload
Gigabit X2 2,000Mbps download, 50Mbps upload
Gigabit Pro 10,000Mbps download, 10,000Mbps upload
Show more (3 items)

Brian L. Roberts, chairman and CEO of Comcast, said during a January 2023 earnings call that Gigabit Plus customers comprise roughly one-third of Xfinity broadband subscribers. That's consistent with OpenVault's latest data for internet customers across the US, which has gigabit (and above) consumption at approximately 32%. According to OpenVault, most customers (36%) opt for a plan of 200 to 400Mbps. The rest of the data shows that 16% go with 100 to 200Mbps, 5% are in the 50-to-100Mbps category, 6% choose 500 to 900Mbps and 5% are on plans under 50Mbps.

For Xfinity, all plans are a hybrid fiber-coaxial cable connection, so customers' download speeds will be much faster than their upload speeds. The one exception is the Gigabit Pro plan, which is a 100% fiber connection. While it's theoretically available throughout Xfinity's national footprint, FCC numbers indicate it's only available to approximately 4% of Xfinity's customer base.

US states where Xfinity was the top ISP

State Median download speed
Colorado 267Mbps
Massachusetts 234Mbps
Michigan 237Mbps
Oregon 240Mbps
Pennsylvania 236Mbps
West Virginia 251Mbps
Show more (1 item)

Comcast's Xfinity internet service is available in 39 states and Washington, DC, giving it a decent chance at grabbing the top spot in several states. It had the slowest showing in Massachusetts at 234Mbps and its fastest download speed at 267Mbps in Colorado.

US cities where Xfinity was the top ISP

City Median download speed
Albuquerque, New Mexico 239Mbps
Aurora, Colorado 261Mbps
Baltimore, Maryland 221Mbps
Colorado Springs, Colorado 286Mbps
Denver, Colorado 239Mbps
Fort Wayne, Indiana 212Mbps
Fresno, California 260Mbps
Memphis, Tennessee 200Mbps
Portland, Oregon 226Mbps
Sacramento, California 238Mbps
Stockton, California 266Mbps
St. Paul, Minnesota 239Mbps
Show more (7 items)

As for city speeds, the Ookla data only considers the country's top 100 most populous cities. On that list, Xfinity was the fastest provider in 12 cities, which put it in second place to AT&T, which grabbed the top spot in 25 US cities. Memphis, Tennessee, brought up the rear for Xfinity, with a median download speed of 200Mbps. Xfinity scored its fastest median download speed in Colorado Springs, Colorado, with 286Mbps.

Final thoughts on Xfinity's speed test results

If you've read any of CNET's home internet coverage, you've heard us say that fiber internet trumps cable internet in just about every way. That's certainly true. But most fiber ISPs with a large national footprint -- AT&T, Frontier, Optimum and Verizon -- don't exclusively offer fiber internet plans. Their coverage areas also include a mix of slower connection types like digital subscriber line. The speed test results in those areas will be significantly lower than the fiber numbers, thus making the providers' total numbers lower. But Xfinity, and other cable internet providers that don't have to deal with DSL dragging down their numbers, will see a much more consistent performance across the country. In that way, cable trumps the fiber-DSL combo.

Xfinity speed test FAQs

Why should I bother to run an Xfinity speed test?

If you feel like your internet connection is performing poorly, running a speed test is one of the quickest ways to see if you're getting the speed your ISP advertised. If you are getting the internet speed you're paying for, then perhaps your struggles mean you need to upgrade to a faster plan. But if your speed test results show speeds below what you should receive, then further investigation is warranted. It could be an issue with your provider (especially if you ran the test while connected via ethernet cable), or you may have uncovered some problems with your Wi-Fi connection.

How fast is Xfinity's cheapest plan?

Xfinity is unique in that it offers at least seven different speed tiers. On top of that, it has different pricing for those plans depending on the area of the country in which you're located. In some areas of the country, the cheapest plan is a 200Mbps plan; in others, the cheapest is its 150Mbps option. Finally, Xfinity also offers a low-income option, Internet Essentials, for eligible customers. That plan is 50-100Mbps.

What is a good speed for Xfinity?

During a recent earnings call, Comcast executives noted that nearly one-third of its customer base subscribes to its 1,200Mbps plan. That said, Xfinity speed test data from Ookla shows that Xfinity's median download speed is 239Mbps, and recent data from OpenVault shows that most US subscribers (approximately 36%) receive 200-400Mbps. Ultimately, a "good speed" depends on the needs of your household. The more users (and connected devices) you have, the greater your need for a higher internet speed tier.