Why is Xfinity Upload Speed So Slow?

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There are times when your Xfinity Internet upload speed is so slow you can barely do anything. Why does this happen? Why is Xfinity’s upload speed so slow?

Xfinity Internet customers may experience slow upload speeds due to high network traffic, too little data, or malware. Fortunately, these problems can be easily resolved.

There are many reasons why you may be experiencing slow uploads with Xfinity Internet. Keep reading to gain a better understanding of why this is happening.

Why Is Xfinity’s Upload Speed So Slow?

As an Xfinity Internet user, you can download files and stream on Netflix at blinding, fast speeds. However, that’s not quite the case when you try to upload files to the internet. 

If you’re experiencing a slow upload speed, you’re probably wondering why this is happening.

Whether it’s a case of a bad network or a poor wireless signal, there are many reasons why your upload speed may be so slow. Some of these reasons include:

  • Your data plan
  • An outdated operating system
  • Malware
  • Router/modem overload
  • High network traffic
  • A poor WiFi connection

Below, we will discuss each of these causes in more detail and give you some information on how they might impact your upload speed.

Your Data Plan is too Slow or too Capped

Typically,a data plan’s upload speeds are significantly lower than its download speeds. If your maximum download speed is 100Mbps, your maximum upload speed may be 10Mbps. 

Xfinity may cap your data if you use too much on an unlimited plan as well, which will also slow down speeds.

This is standard practice for more Internet providers. But how can you fix it?

The Fix: Upgrade Your Data Plan

Upgrade to a faster data plan. This will increase your speed and allow you to upload items more efficiently. Costs may vary, but speed will definitely improve.

An Outdated Operating System

Using out-of-date software on your computer or smartphone can negatively affect your upload speed. This is because technology is rapidly evolving and updating on a day-to-day basis.

New hardware is created regularly to keep up with the supply and demand of new tech.

The Fix: Update Your Smart Device

Technology is constantly being updated and becomes out of date quickly. To combat this, it is important to update your smartphone, laptop, or tablet regularly.

This will provide you with the newest microchips and hardware to enhance the speed of your uploads.


Your upload speeds may be affected if your computer picks up any malware as you browse the web. 

The Fix: Scan Your Device

To reduce your chances of falling victim to these malicious cyber-attacks, avoid visiting shady websites, downloading unsecure files, and clicking on pop-ups.

Install credible antivirus software on your phone or computer to tackle future cyberattacks.

Router/Modem Overload

Too many devices are connected to one router or gateway slows down your internet speed. This also often happens with older or faulty equipment. 

Try disconnecting some devices in your home from your router, then see if your upload speed improves. If not, you may want to try updating your router to a new one.

The Fix: Limit Devices

Limit the number of devices connected to your router. A lesser load will ensure more upload and download speeds.

High Network Traffic

If you’re trying to upload at a time when there is high traffic on the internet, it will likely take longer. 

Network congestion occurs when too many users are active on the internet, resulting in slower speeds. People are usually busy on the internet during the daytime.

The Fix: Try a Different Time of Day

Try uploading at a time when there’s less internet traffic. Mid-morning and mid-afternoon are often great options, as many people are at work and are less likely to be uploading data.

A Poor WiFi Connection

When your WiFi signal isn’t strong enough, it won’t support your uploads. Sometimes, your WiFi may be weak and slow, but it will still allow you to stream online and download. 

Upload speeds are generally impacted more, often becoming slow or completely static.

The Fix: The Trifecta

When it comes to poor wifi connection, there is a specific trifecta you should use to attempt to boost Xfinity’s WiFi signal. The best three tips to do this are:

  • Restart your router by unplugging it from the outlet and then plugging it back in.
  • Change the position of your router. Place it away from devices like radios and microwaves to avoid signal interference.
  • Use an Ethernet cable to connect to the internet rather than a wireless connection.

These three quick fixes can be done on your own and often improve internet quality speed marginally.

What is a Good Xfinity Upload Speed?

You know you’re uploading at a good speed when your speed test shows a count between 5-10 Mbps. 

This is relatively good, considering that the FCC sets the minimum upload speed limit at 3Mbps. Anything at this speed or above is considered “high-speed capacity.”

Luckily, Xfinity provides upload speeds as fast as 30 Mbps. If you’re experiencing anything slower than this, you may want to check out some troubleshooting tips.


It can be confusing to experience uninterrupted download speeds but be unable to upload one short video on YouTube. 

You can fix this problem with Xfinity Internet and enjoy faster upload speeds, ranging from malware to high network traffic to too low of a data plan.

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