How to fix 100% CPU usage

By Justin Zeng  Technical Tips  high CPUWindows   0 Comment

Are you suffering from the 100% CPU usage issue? Don’t worry… Although it’s incredibly frustrating, you’re definitely not the only person to experience this problem. Thousands of users have recently reported the very same issue. More importantly, you should be able to fix it pretty easily.

Fixes to try

Here’s a list of fixes that have resolved this problem for other users. You don’t have to try them all. Just work your way through the list until you find the one that does the trick for you.

  1. End the processes that consume lots of CPU resources
  2. Modify Settings in Registry Editor
  3. Run an antivirus scan
  4. Disable P2P Share
  5. Modify Windows notification settings
  6. Bonus tip: Update your drivers

Fix 1: End the processes that consume lots of CPU resources

When you notice that your PC becomes slower than usual and the CPU usage is at 100%, try opening Task Manager to check which processes are hogging so much CPU usage. Here is how to do it:

  1. On your keyboard, press Ctrl, Shift and Esc to open Task Manager. You’ll be prompted for permission. Click Yes to run Task Manager.
  2. Click the CPU column header to sort the processes by CPU usage. Now you can check which processes eat up your CPU.

    Before you end the processes that eat up your CPU, you should Google the process name to check whether it is safe to kill or not.
  3. Select the process that consumes lots of your CPU and then click End task to kill this process.

See if the CPU usage is still at 100% after you end all the process that eat up the CPU. If not, this issue is resolved. If this issue persists, try the next fix.

Fix 2: Modify Settings in Registry Editor

If you’re using Windows 10, this issue may be caused by Cortana. If you enabled Cortana, you may encounter the 100% CPU usage issue.

If you seldom use Cortana, try modifying settings in Registry Editor to see if you can fix this issue. Here is how to do it:

Faulty modifying settings in Registry Editor could cause irretrievable errors to your system. So before you make any changes, please make sure that you have backed up your Registry first.
  1. On your keyboard, press the Windows logo key and R at the same time to open the Run dialog. Type regedit and then press Enter to open Registry Editor. You’ll be prompted for permission. Click Yes to open it.

  2. Follow the path to locate the correct system files:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TimeBroker
  3. On the right side of the pane, right-click Start entry, then select Modify…
  4. Change the Value data to 4, then click OK to save the change.

    Some features of your Cortana will be affected after the change. If you are a heavy user of Cortana, this option might not be appropriate for you.

See if this annoying issue remains. If not, you’ve resolved this issue. If this problem reappears, don’t worry. There are more fixes for you to try.

Fix 3: Run an antivirus scan

The 100% CPU usage issue is also probably caused by viruses on your PC. So try running an antivirus scan to see if there are viruses, spywares or Trojans on your PC.

If there are viruses detected after you scan your PC, you need to delete them immediately. After you deleted all the viruses, this issue will be fixed. If there is no viruses detected, maybe this issue is not triggered by the viruses on your PC, and you can try the next fix.

Fix 4: Disable P2P Share

The P2P Share feature on your Windows 10 PC may also caused the 100% CPU usage issue. Try disabling this feature to see if this issue can get fixed. Here is how to do it:

  1. On your keyboard, press the Windows logo key and I at the same time to open Windows Settings. Then click Update & Security.
  2. Click Advanced options.
  3. Scroll down a little bit and then click Delivery Optimization.

  4. Turn off the toggle under Allow downloads from other PCs. You’ll be prompted for permission. Click Yes to turn this feature off.

See if the issue persists after you turn off this feature. If this issue remains, try disabling Windows Notification.

Fix 5: Modify Windows notification settings

This issue may be triggered by the Windows notification settings on your Windows 10 PC. Follow the instructions below to modify Windows notification settings to see if you can resolve this annoying issue:

  1. On your keyboard, press the Windows logo key and I at the same time to open Windows Settings. Then click System.
  2. Select Notifications & actions on the left side of the pane. Then scroll down a little bit on the right side pane to turn off the feature Get tips, tricks, and suggestions as you use Windows

See if this annoying issue reappears after you turn off Windows Notification. If not, the 100% CPU usage issue is resolved.

Bonus tip: Update your drivers

If you still suffer from the 100% CPU usage issue after trying all the fixes above, we highly recommend you to update all your available device drivers. Some outdated or missing drivers may also trigger this annoying issue. By updating your drivers to the latest version, you may resolve this issue.

Here’re two trusted ways you can update your device drivers — manually or automatically.

Manual driver update – You can update your device drivers manually by going to the manufacturer’s website, and searching for the most recent correct driver for the exact device. Be sure to choose the drivers that are compatible with your variant of Windows system versions.

Or

Automatic driver update – If you don’t have the time, patience or computer skills to update your drivers manually, you can, instead, do it automatically with Driver EasyDriver Easy will automatically recognize your system and find the correct drivers for your devices, and your variant of Windows system, and it will download and install them correctly:

  1. Download and install Driver Easy.
  2. Run Driver Easy and click the Scan Now button. Driver Easy will then scan your computer and detect any problem drivers.
  3. Click the Update button next to any flagged device driver to automatically download the correct driver, then you can manually install it. (you can do this with the FREE version).

    Or click Update All to automatically download and install the correct version of all the drivers that are missing or out of date on your system. (This requires the Pro version which comes with full support and a 30-day money back guarantee. You’ll be prompted to upgrade when you click Update All.)

    You can do it for free if you like, but it’s partly manual.
    If you have any issue with Driver Easy, please contact Driver Easy’s support team at support@drivereasy.com for advice. You should attach the URL of this article so they can help you better.

Hopefully one of the fixes above can help you resolve this issue. Please leave your comment below if you have any questions.

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