How to Eliminate High Disk and CPU Usage by Super Fetch in Windows 10

  • Superfetch is a feature that has already been introduced in Windows Vista.
  • The service quietly runs in the background, constantly analyzing your RAM usage patterns and examining which applications you run most often.
  • It marks these applications as “frequently used” and loads them into RAM prematurely.
  • If you have a virus or malware on your Windows 10 computer, the most common sign is a high CPU load.
  • As a result, your SysMain service may not work properly and cause errors.

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What Is Disk In Task Manager

Your disk is fully occupied when it has reached its maximum capacity, i.e. when your disk is at its maximum capacity. As hard-disks have specific read/write speeds, they usually range between 100mbps and 150mbps. If the combined read/write speeds surpass 100-150mbps, 100-150mbps will result in 100% disk usage.

Sometimes your Windows 10 system will slow to a crawl even though you have a powerful CPU, plenty of RAM, and just a couple of apps running. While many factors can cause this, one is that the hard drive is working at or near 100 percent. It doesn’t have the spare cycles to perform routine OS tasks. This results in everything slowing down. A simple reboot, which often solves many OS issues, won’t fix an over-worked drive. Here are some of the things you can do to fix the disk usage problem in Windows 10.

Windows Vista already has a Superfetch feature that is meant to improve system performance over time, but this is only a vague explanation.

100 Percent Disk Usage Windows 10

This will allow you to make a temporary change and see if it improves Windows Search performance. If the issue persists, you can remove Windows Search permanently. To do this, hit the Windows key and type services.msc in the search box and click OK or enter.

What Is Superfetch Windows 10

Using Superfetch, the app will run much faster as it will be preloaded in RAM. You can find it as “Service Host: SysMain” in the Windows Task Manager.


By using data collected from your computer usage, SysMain is able to enhance your computer’s performance, such as by speeding up app launch times.

Disabling SuperFetch will help you if your computer is running slowly or you’re experiencing high disk usage.

In the background, this service analyzes the RAM usage patterns of your computer and identifies which applications you use most frequently. As a result, Superfetch loads these applications prematurely from RAM in response to their frequent usage patterns.

As we will see in this article, there are a number of reasons that Superfetch may be using your hard drive or CPU in this way. Before we get into the issue of high hard drive utilization, we first need to understand why this may be going on.

What causes high hard drive or CPU utilization when using Superfetch?

  • If your system does not have the latest hardware, Superfetch can easily cause a high load on your hard drive since it copies all frequently used files to RAM.
  • Windows 10 computers with viruses or malware will have a high CPU load, which may lead to errors with the SysMain service.

How to fix high hard drive or CPU load using Super Fetch?

Updated: February 2024

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Disable Superfetch

By stopping the Windows Service, this feature can be disabled most easily.

You may need to disable Service Host Superfetch if your disk space is always being used up by Superfetch. 

Remove the latest Windows updates

  1. You can find the Control Panel by typing “Control Panel” into the Windows search box, then pressing Enter.
  2. You can uninstall programs by going to the Programs menu
  3. To view installed updates, click View Installed Updates.
  4. The most recent update for Microsoft Windows can be found under the Microsoft Windows section.
  5. Select Uninstall from the right-click menu.
  6. Your computer needs to be restarted.

Run the Windows Update Troubleshooter

  1. Select Settings from the Windows Start menu by right-clicking.
  2. Check out the security and updates section
  3. From the left-hand menu, select Troubleshooting.
  4. On the right side of the screen, select Windows Update.
  5. You will be prompted to run troubleshooting.

Disable Host SuperFetch service through Tools

  1. You can also use Windows search to find what you are looking for.
  2. Enter services.MSC.
  3. Sort by name
  4. The SuperFetch or SysMain entry can be found at the bottom of the page.
  5. Select Properties from the right-click menu.
  6. Select Disabled as the startup type.
  7. Then click OK to apply the changes.
  8. Your computer needs to be restarted.

RECOMMENATION: Click here for help with Windows errors.

Frequently Asked Questions

Superfetch is a type of caching on your hard drive. It copies all frequently used files to RAM. This allows programs to run faster. However, if your system is not equipped with the latest hardware, the Superfetch Host Service can easily cause a high load on your hard drive.

  1. Remove third-party browsers.
  2. Run Chkdsk.
  3. Disable cloud protection in Windows Defender.
  4. Disable the Windows search indexer.
  5. Disable the Print Spooler service.
  6. Adjust the visual effects.
  7. Update the device drivers.
  8. Run the SFC and DISM.

Driver incompatibility issues: Some hardware manufacturers still need to update their drivers to work with Windows 10, which causes performance issues. Driver incompatibilities can cause memory leaks, resulting in high CPU and memory usage.

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Mark Ginter is a tech blogger with a passion for all things gadgets and gizmos. A self-proclaimed "geek", Mark has been blogging about technology for over 15 years. His blog,, covers a wide range of topics including new product releases, industry news, and tips and tricks for getting the most out of your devices. If you're looking for someone who can keep you up-to-date with all the latest tech news and developments, then be sure to follow him over at Microsoft.