Xfinity Upload Speed Slow: How To Troubleshoot

I’ve had Xfinity Internet for a long time. I use it to watch TV shows, upload YouTube videos, and browse internet forums. I realized one day that it took me 4 hours to upload a 4K video to YouTube, even though I can watch Netflix shows without buffering.

Xfinity Upload Speed Slow
Xfinity Upload Speed Slow

This would not do, so I had to change it. I researched various articles and guides on the internet to better understand this subject. Finally, I decided to write this comprehensive article to assist others in my situation.

Xfinity Upload Speed Slow, to improve your Xfinity Upload Speed, Restart your router and reposition it, so it is in range of your devices. After that, update your computer and scan it for bugs/viruses that may slow it down.

Video: Xfinity internet speed increase

Xfinity internet speed increase


Businesses, students, content creators, telecommuters, and gamers require faster upload speeds.

You may be required to upload photos, audio, or video to the web and backup emails and files to cloud storage.

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Xfinity Upload Speed Slow

Most services provide faster download speeds, but upload speeds are typically in the 10 Mbps range.

The Xfinity upload speed is really sluggish; why is this?

The slowness of your Xfinity connection might be due to any of these two factors: The internet package you have chosen is too slow. Although you paid for premium internet service, you aren’t experiencing the promised speeds.

You’d need at least a few hours to upload raw footage in the hundreds of gigabytes range. But at 300 Mbps, it would only take a few minutes.

Many employees are required by businesses to upload and download files simultaneously.

This is where upload speed is most important. Improved upload speeds are required for the following:

  • Participating in online classes and completing assignments
  • People who use video conferencing
  • Playing video games online
  • Backup of critical data
  • Apps such as Google Docs, Dropbox, and others

Taking Online Classes

Online classes have recently become popular. As a result, students must attend classes via various online platforms.

Upload speed is critical for everything from uploading assignments, exam papers, and so on to attending video conferences and presenting projects.

Conferencing via video

Nowadays, meeting your friends in person is impossible. As a result, the frequency with which video conferences are hosted has increased.

You would never want to experience awkward pauses and breaks while conversing with loved ones.

Professional interviews and work meetings are also now held online.

However, improved speed and connectivity ensure you don’t miss out on communicating important information.

Online Game Playing

Playing online games necessitates constant updating of your current knowledge.

Furthermore, a standard upload speed is required to load this data and make it available to the game servers.

Poor upload speeds can cause game lag, lowering your performance.

You’ll also need a fast upload speed to stream your gameplay to a large audience on Twitch.

Backing Up Important Data We all have pictures, videos, and files we don’t want to lose.

However, there is a chance that they will be erased if your device encounters a bug.

Backup these files to Google Drive or cloud storage requires a faster upload speed.

Certain applications

If you’ve ever used Google Docs or Dropbox, you’ll know that the data is uploaded as soon as you enter it.

Working on these apps will be difficult and frustrating if the speed is slow.

One of the advantages of newer connections of multiple devices particularly fiber connections is that they have symmetrical speeds. This means they have the same upload and download speeds.


We understand that waiting for hours for a simple video upload is excruciating. To begin diagnosing the problem, contact your internet service provider.


Your router, software, the number of device connections, and a variety of other factors could all be factors.

Several factors can cause a slow upload rate. They are as follows:

  • Data Capsules
  • Firewalls from third parties
  • Company Limitations
  • Router or modem failure
  • There are too many connected devices.

Let us delve into the specifics.

Data Capsules

The issue could be caused by issues and limitations on the part of your service provider. For example, they could impose data caps, limiting uploading and downloading.

The data cap will differ depending on the plan you select. Therefore, it would be preferable if you contacted them to resolve this issue.

Firewalls from third parties

Your device’s third-party firewall or antivirus software may also slow down your internet connection and cause errors of wi-fi speed.

This usually occurs when you use your firewall rather than the computers’.

It checks all files while they are being uploaded or downloaded, slowing down the device on your Xfinity wifi.

Uninstall the current firewall and see if the speeds improve. If this is the case, you should look for a better-suited firewall for your device speed test.

Company Limitations

Your data may sometimes be limited by the company for which you work. For example, they may impose data caps that limit your uploading and downloading.

Router or modem failure

Slower speeds can be caused by the firmware installed inside the modem and its physical state. Your router may develop bugs, wear out, and become obsolete over time. Keeping it up to date could be a solution.

If you’re interested, we’ve compiled a list of the best Xfinity modems. To avoid this, keep your firmware up to date. Viruses or malware on your router or device can also slow down your devices.

Viruses will run programs in the background, consuming data and causing a slowdown.

There is too many connected devices.

The number of connected devices connected to your internet can also impact speed.

Furthermore, the number of actively connected devices will reduce connection speed even further.

Keep an eye on and limit the number of devices connected to your Wi-Fi. This is possible with a variety of available apps.

Note: If your internet speed is 80% slower than your provider promised, it needs to be improved.



Here’s how to boost your Xfinity Upload Speed:

  • Reboot the router or device.
  • Using Ethernet cable to connect PCs
  • Examining the Internet package
  • Reduce the number of network connections.
  • PC updating and scanning
  • Checking the status of the modem Replacing the router or ISP
  • Router repositioning and network selection
  • Please get in touch with Comcast.

Let’s take a closer look at some of these.

Why Is ATT Internet So Slow? [10 Easy Solutions To Try]

Restart the Router or the Device

Your router, modem, or another device may become stuck at times. To resolve any temporary fluctuations, turn these devices off and on. Check these devices for loose connections as well.

Make use of an Ethernet cable.

Using a wired connection may aid in improving connectivity speed. However, the router could be to blame.

Disable Wi-Fi before connecting the PC to the modem via an Ethernet cable.

Hardwiring improves performance and speed. Although Ethernet does not always work, you can get faster upload speeds.

Cables can corrode, and there may be some loose fittings. As a result, changing it may help solve the problem or narrow down the causes.

Examine your Internet package.

You may have chosen a plan with a lower upload speed or download speed by mistake. As a result, your network may be sluggish due to the lower bandwidth of your plan. You can, however, upgrade your current plan to gain access to faster speeds.

Examine your Internet package
Examine your Internet package

Reduce the number of network connections.

The number of active connections can cause the network to slow down. So, while you’re uploading files, stop sharing the network.

PC Update and Scan

Ascertain that your computer is up to date. Outdated drivers and operating system versions can cause network issues.

Also, scan your PC for any possible malware or adware slowing down your device.

Because PCs accumulate a large number of temporary files, cleaning them provides a solution.

Please get in touch with Comcast.

If none of the solutions above resolve the issue, contact the Comcast help desk.

You have two options:

  • Call Comcast Retention at 1-800-XFINITY or
  • Chat with them online on the Xfinity website


Because many people work from home, network congestion may contribute to the slower pace. You can, however, wait and try uploading at a lower traffic time, such as early morning.

If your upload speed is zero, it could be due to something else, such as damaged ethernet cables. You could also try a different browser than your current one (Chrome, Firefox, Opera, etc.).



Why is Xfinity’s upload speed so slow?

Your Xfinity internet may be slow because your current plan does not provide enough bandwidth to keep up with your internet usage. This is especially true if you’ve begun working or learning from home.

Is Xfinity slowing down my upload speed?

Do you have a throttled internet connection near the end of the month? You may have reached your monthly data limit. Most ISPs have a data cap, which limits how much data you can upload or download at full speed during a billing cycle.

What is the cause of my slow upload speed?

The internet plan itself is the primary cause of slow upload speeds, particularly when compared to download speeds. Except for fiber internet service, most internet service provider plans typically have max upload speeds of a tenth or less of their advertised download speeds.

What is a reasonable upload speed?

What is a reasonable upload speed? In general, 5 Mbps is a good upload speed to aim for. Asymmetric DSL (ADSL) typically has upload speeds of up to 1.5 Mbps, whereas cable internet has upload speeds ranging from 5 Mbps to 50 Mbps. However, even ADSL’s 1.5 Mbps connection is sufficient for most online activities.

CEO and Networketing at Sycamorenet | + posts

I am passionate about networking internet technology and connecting the world. I believe that we can make a difference by providing unique solutions that are reliable and easy to use. I am constantly innovating and expanding our reach to new markets. Our goal is to provide global access to affordable, high-quality internet connectivity. Join us in our mission to connect the world!

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