Comcast throttling Netflix - How to test and fix it

While Comcast has admitted to throttling internet speeds in the past, according to its most recent public announcement on the issue, it no longer carries out the practice. However, plenty of users are convinced that the company may still be selectively throttling speeds. In particular, users complain that Comcast is throttling Netflix and other bandwidth-heavy platforms, such as YouTube and Skype.

So how can you be sure? Developers have created an app that enables you to test whether or not your Internet Service Provider (ISP) is throttling certain streaming and communication applications. And thankfully, if you find that Comcast or any other provider is throttling Netflix, YouTube, and other apps, there is a simple solution. A Virtual Private Network (VPN) will encrypt your internet traffic making it impossible for Comcast to see what you’re doing online, including which platform you’re using.

In this post, we reveal how to test whether or not Comcast is throttling Netflix, and in case it is, how to use a VPN to fix it.

How to test if Comcast is throttling Netflix and other services

Researchers at Northeastern University have come up with a nifty tool called Wehe to help you test if your ISP is throttling popular apps, such as Netflix, YouTube, Spotify, Skype, and Vimeo. It tests the speeds of the apps in question against the speeds of other apps on your device. A discrepancy indicates that your ISP is throttling speeds. Wehe is currently available for Android and iOS.

We recommend reading through the relatively short consent form before using the app, as indicated in the instructions below.

Here’s how to use Wehe to to see if Comcast is throttling:

  1. Download the Wehe app for your mobile device.
  2. Ensure you’re connected to your home wifi network.
  3. Launch the app and read through the consent form (see note below). Hit Accept if you’re okay with it.
  4. Select Run Tests from the menu.Wehe settings to test Comcast throttling Netflix.
  5. Use the toggle buttons to choose which apps you want to run tests on. For example, if you’re only interested in Netflix, toggle the others to the off (white) position.
  6. Hit the blue Run Tests button. Results for each app will show up as the test is run.
  7. To view previous results, choose Previous Results from the menu.

Wehe throttling results.

Each app could take a few minutes to test. As such, it’s best to select only the ones you’re really interested in. Bear in mind that you can use this app to test providers other than Comcast.

Note: This tool is part of a research study and isn’t exactly privacy-forward. It does collect some information, mainly metadata, such as timestamps, your operating system, and your general location (no more specific than within 1km), but none of this can be used to identify you. There is a possibility that your IP address is visible to researchers. This is anonymized after the data has been processed, but it still may be something some users are uncomfortable with.

Wehe consent form.

How to stop Comcast throttling Netflix and YouTube

Did you find that Comcast is indeed throttling Netflix or another app? A VPN can help. When you connect to a VPN, all your traffic is encrypted and runs through an intermediary server. The encryption means that no one, not even your ISP, can view the contents of your traffic. So at any given moment, they can’t tell which sites your using or if you’re browsing, streaming, or downloading.

Here’s how to stop Comcast throttling Netflix using a VPN:

  1. Sign up for a reputable VPN service. We recommend ExpressVPN, but NordVPN and Hotspot Shield are great budget alternatives.
  2. Download the appropriate app for your device and log in using your new credentials.
  3. Connect to a server in a location of your choice. If you’re looking for the fastest server, some providers will automatically connect you to the fastest one for your location. Otherwise, choosing a geographically close one is your best bet.
  4. Open up your Netflix app and start streaming!

Note that you can use the same steps to prevent throttling on other platforms such as YouTube and Skype. And bear in mind, you’re not restricted to using US services. With a VPN, you can access streaming platforms that are usually restricted to other countries, such as BBC iPlayer, Hulu, and other countries’ Netflix libraries. Simply connect to a server in the streaming source location (for example a UK server for BBC iPlayer) and access the service.

Related: Best VPNs for Comcast Xfinity

Netflix app doesn’t work? Try this fix

Netflix doesn’t allow users to access other countries’ libraries due to licensing restrictions. The ability of VPNs to bypass these restrictions has made them popular tools for unblocking Netflix libraries from abroad. Netflix has taken notice of this practice and actively blocks users when it detects they are using a VPN.

Netflix can’t determine a VPN user’s real location so it attempts to block all VPN traffic. This means that even if you’re located within the US, if Netflix detects you’re using a VPN, it will stop you from accessing the US Netflix catalog. In this case, you likely see a proxy error that reads:

“Whoops, something went wrong. Streaming error. You seem to be using an unblocker or proxy. Please turn off any of these services and try again.”

Netflix proxy error

Thankfully, several top VPNs, including the ones mentioned above, can reliably unblock Netflix US and some other countries’ versions.

That being said, not every server will work, so you may have to check with your VPN customer support team to find out which ones to use. This sounds like a hassle, but with the best VPN providers offering 24/7 live-chat customer support, this should only take a couple of minutes.

If you’re still having issues after connecting to a recommended server, a VPN customer support representative should be able to walk you through additional steps to help resolve the issue.

Comcast’s throttling past

In 2006, Comcast started deliberately throttling BitTorrent traffic. In 2008, the FCC ruled that this practice was discriminatory and should be abandoned. In the wake of the controversy that followed, Comcast switched to a new “congestion management system.” Instead of throttling specific apps, this new system throttled the general speed for what the company referred to as “heavy internet users.”

In June, 2018, Comcast announced it had stopped this practice, although in the announcement it reserved the right to implement a similar one if deemed necessary.

Comcast Xfinity throttling update.

While it hasn’t announced such a new system, many users are convinced that Comcast throttles their speeds for certain applications. Here is one of the recent comments on the Xfinity support forum involving a customer claiming throttling by the provider. This user claims he has trouble streaming via YouTube due to throttling:

Comcast user throttling claim.

Will a VPN help me with my data cap?

Unfortunately, no.

A VPN will prevent Comcast seeing the contents of your internet traffic. However, your ISP will still be able to see how much data is passing through its network.

Most Comcast customers have a monthly data cap of 1TB. If you’re consistently going over that limit and enduring excessive overage charges, you may be better off going with an unlimited data plan.

Here is the breakdown:

  • Terabyte Internet Data Usage Plan: Basic fee covers 1TB of data. Pay $10 per extra 50 GB of data up to $200 per month.
  • Unlimited Data Option: Basic fee plus $50 per month gives you unlimited data.

Comcast data plans.