Comcast Test Speed

Packet Loss, Latency, and Jitter Explained

Packet Loss

An internet speed test measures the connection speed and quality of your connected device to the internet. It does so by running multiple consecutive tests that analyze different aspects of your internet connection, namely ping (latency), download speed, and upload speed.Each of these values represents the connection's specific qualities, which you can read more about in the paragraph after.

In this chart we show the average download speed across all 40,985,846 users who ran a speed test on their XFINITY from Comcast internet connection in the last 12 months. Xfinity Speed Test FAQ Xfinity speed test results shown above are based on thousands of real-world Comcast Xfinity connections. XFINITY Speed Test Speedchecker.io is a free service that provides users with a third-party integrated tool for testing your Internet Speed within seconds and free of cost. This speed test is conducted by sending and receiving data from your computer using your Internet connection.

Packet loss occurs when packets of data do not reach their intended destination - usually because of network congestion. A high packet loss percentage will indicate that you are trying to move more information than your present network can support, resulting in packets being dropped. you've experienced packet loss during a VoIP call when someone cuts in and out, or when a video becomes choppy or glitchy since the information isn't reaching its intended destination. For the purposes of our test, we assume no packet loss.

Giant

Comcast Test Speed Of Internet Connection

Latency

Latency is the measure of time it takes for information to be encoded and delivered to the intended destination. High latency is oftentimes referred to as lag. High latency causes the timing of VoIP conversations to be off. Words and phrases may overlap, causing users start talking over one another unintentionally. In video streaming and conferencing, videos move slowly or take long times to buffer. This is why gamers are in particular watchful of high lag connections. High latency can also impact businesses who use instant messaging or rely on data-intensive applications such as those in the financial and medical industries.

Jitter

Jitter is the variation in packet / information arrival time. High jitter, or high variation in delivery time, results in choppy voice calls or glitchy-sounding looking video quality for businesses using cloud-based phone systems. But, the impact of jitter doesn’t stop there. Jitter can affect applications that rely on very accurate timing, such as those in manufacturing or other automation-based industries.

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.

Internet Speed Test Sites (Last Updated November 2016)

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?

Comcast Diagnostic Test

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 Gateway Speed Test

Test

Speedtest By Ookla - The Global Broadband Speed Test

Xfinity Internet Speeds in Context

Comcast Test Speeds

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.