If Your Computer Slows Down When Connected to the Internet, Try This
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If your computer slows down when connected to the internet, it might be difficult to nail down the cause. After all, you wouldn’t think that being online has anything to do with how fast your PC runs.

However, there are several reasons that going online can cause your computer to run slowly. Let’s look at several of these and how you can resolve them.

Speed vs. Internet Speed

Before we begin, note that we’re discussing fixes for why your computer becomes slow after connecting to the internet. That slowness affects everything, from opening files to swapping between programs. While this tends to affect less powerful computers, it can happen to anyone.

This is a separate issue from an overall slow internet connection. If you have that problem, review common items that can slow down your home network 9 Things That Might Be Slowing Down Your Home Wi-Fi Network 9 Things That Might Be Slowing Down Your Home Wi-Fi Network Tired of slow or spotty internet? Check these things that could be slowing down your home Wi-Fi network. Read More instead.

1. Windows Update at Work

If your computer isn’t connected to the internet all the time, it has to do a lot of catching up when you get back online. One of the major contributors to this problem is Windows Update.

Because Windows 10 regularly checks for and applies updates in the background, you might notice a sudden slowdown when you go online. This isn’t as much of a problem as it was on prior Windows versions, but it can still slow your system while Windows Update does its job.

Configure Windows Update

Windows 10 Delivery Optimization

To combat this, you can tweak a few Windows Update settings. Visit Settings > Update & Security > Delivery Optimization. If you have the Allow downloads from other PCs slider turned on, Windows will use a peer-to-peer-like connection to share pieces of Windows updates between your machine and others. You can select to share with PCs on your local network, or the internet at large.

If you have this setting turned on, try turning it off and see if that helps your issue. Conversely, if it’s turned off, perhaps turning it on will help you get updates more efficiently. We recommend you don’t share updates with the entire internet, though.

Select Advanced options on this page for another useful setting. Here you can choose to limit the percentage of bandwidth Windows 10 uses for downloading (and uploading, if applicable) updates in both the foreground and background. This is an easy way to make Windows Update work less heavily without totally cutting it off.

Windows 10 Update Advanced Options

If you need a more drastic measure, you can pause all Windows updates for a while 7 Ways to Temporarily Turn Off Windows Update in Windows 10 7 Ways to Temporarily Turn Off Windows Update in Windows 10 Windows Update keeps your system patched and safe. In Windows 10 you're at the mercy of Microsoft's schedule unless you know hidden settings and tweaks. So, keep Windows Update under control. Read More . Switch to the Windows Update tab and select Advanced options. This lets you enable the Pause updates slider to prevent Windows updates from installing for up to 35 days.

When you’re ready to install updates, turn this feature off and let Windows Update run. Then you can turn it on again until you’re ready the next time. Note that doing this will prevent you from getting timely patches that may be critical, however.

Windows 10 Pause Updates

2. Cloud Storage Syncing

Windows Update isn’t the only service that regularly uses a lot of network bandwidth. If you use cloud storage services like Dropbox, Google Drive, or OneDrive, they regularly check for new files to sync. Most of the time, this shouldn’t be a big deal, but if they suddenly start working with a ton of files, your computer could slow way down.

Sometimes your cloud storage goes to work when you’re not expecting it. If you have the mobile camera upload feature turned on and return home after taking a ton of pictures, it could chug along while it syncs all those. Or if you’re just placed a huge video in cloud storage, it could take an hour or more to upload.

While the software is working heavily, it can impact your computer’s overall performance. The solution is similar to what we discussed for Windows Update. If you don’t want your cloud storage apps to sync, right-click their icon in the System Tray and choose Pause Syncing. If your system returns to normal after doing this, you’ve found the problem.

Google Drive Pause Sync

To lessen the impact of syncing without totally stopping it, open the settings panel for your chosen app. Most of them have a Bandwidth or similar section that let you control how much work your apps do in the background.

It’s not just cloud storage that can have this problem. Network-heavy tools like BitTorrent could cause it too. If you use backup software that backs up to the cloud, such as Backblaze, you might experience something similar. Take a look at its settings to remedy this and consider setting a specific time to back up each day when you’re not using the computer.

Dropbox Limit Bandwidth

3. A Malware Infection

Another reason your computer might run slow when connected to the internet is a virus or other malware wreaking havoc. Often, malware abuses your network connection in order to phone home with data, use your bandwidth as part of a botnet, or even just to annoy you.

While these can result in a slow network connection, you can also experience your computer’s performance grinding to a halt. In order to find out, you should run a scan with your antivirus program. To get a second opinion, and check for malware that standard antivirus software might not find, we recommend also scanning for malware with the free version of Malwarebytes.

If you find anything, take the recommended action to quarantine or delete it. Then see if your computer runs any better when online.

4. Hard Drive Performance

While not as likely as the above scenarios, if your PC slows down when connected to the internet, perhaps your hard drive deserves the blame.

As you may know, traditional hard disk drives (HDDs) having moving parts and are thus much slower than solid-state drives (SSDs). If you have an extremely fast internet connection, it’s possible that your internet speed is so fast that your drive can’t keep up.

For instance, your connection may download large files faster than your hard drive can write them to the disk. This will lead to a system slowdown, as your HDD works overtime to finish the job.

If you’ve ruled out the above causes and still have an HDD in your computer, we recommend upgrading to an SSD. Not only will it likely solve your problem, but an SSD makes every aspect of your computer faster. It’s a great all-around upgrade.

See our guide on moving Windows from an HDD to SSD How to Move Windows from HDD to SSD to Improve Performance How to Move Windows from HDD to SSD to Improve Performance A Solid State Drive upgrade really improves performance. But how can you squeeze a large Windows installation onto a tiny SSD? Windows users can comfortably migrate from HDD to SSD in very little time. Read More for help.

Diagnosing Further Performance Issues

Task Manager Network Usage

The above four cases cover common reasons why your computer performance suffers once you go online. In most instances, your whole system will slow down when a process uses a heavy amount of network resources. You can check this yourself to diagnose the problem if the above tips haven’t helped you.

To do so, open the Task Manager by pressing Ctrl + Shift + Esc. Click More details to expand this if you only see a list of app names. On the Processes tab, click the Network header to sort by the processing using the most bandwidth. This will help you figure out what’s straining your connection What's Using My Bandwidth? 5 Tips to Monitor Home Network Usage What's Using My Bandwidth? 5 Tips to Monitor Home Network Usage Is something draining your internet bandwidth capacity? Check and troubleshoot what is using your bandwidth with these tips. Read More and slowing your PC down.

For more info, switch to the Performance tab and choose Open Resource Monitor. The Network tab in that utility provides more details on what apps are doing with your network connection.

Finally, you should make sure you’ve updated your drivers How to Find & Replace Outdated Windows Drivers How to Find & Replace Outdated Windows Drivers Your drivers might be outdated and need updating, but how are you to know? Here's what you need to know and how to go about it. Read More , particularly network and chipset drivers, to the latest version. It’s possible that a buggy driver has caused your problem.

Keep Performance High, Even When Offline

Next time your computer slows down when connected to the internet, you’ll know what to do. Hopefully this is a temporary problem that clears up once an app has finished its task.

If your computer still feels slow and you know it’s not a network issue, see how to increase the performance of Windows 10 14 Ways to Make Windows 10 Faster and Improve Performance 14 Ways to Make Windows 10 Faster and Improve Performance It's not hard to make Windows 10 faster. Here are several methods to improve the speed and performance of Windows 10. Read More to make it feel faster overall.

Explore more about: Network Issues, Performance Tweaks, Windows Tips.

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