5 Ways to Fix High Disk Usage “Service Host Sysmain” on Your PC in 2023

If you’re a Windows user, you might have encountered the frustrating issue of high disk usage caused by “Service Host Sysmain.” This issue can slow down your computer and disrupt your workflow. Don’t worry; we’ve got you covered. In this article, we’ll explore five effective ways to fix the high disk usage problem caused by “Service Host Sysmain” on your PC in 2023. These solutions are designed to optimize your system’s performance and enhance your overall computing experience.


Service Host Sysmain, also known as Superfetch in older Windows versions, is a crucial system process responsible for optimizing the performance of your PC. It does so by preloading applications into the memory, making them launch faster when you need them. However, in some instances, Service Host Sysmain can cause high disk usage, which leads to sluggish system performance. Let’s delve into five practical methods to address this issue.

1. Disable Sysmain (Superfetch) Service

Disabling the Sysmain service is the most direct approach to resolving the high disk usage problem. Here’s how you can do it:

Step 1: Press Windows + R to open the Run dialog.

Step 2: Type services.msc and hit Enter. This will open the Services window.

Step 3: Scroll down to find “Superfetch” (Sysmain) in the list of services.

Step 4: Right-click on “Superfetch” (Sysmain) and select “Properties.”

Step 5: In the “Startup type” dropdown, choose “Disabled.

Step 6: Click “Apply” and then “OK.

Step 7: Restart your computer.

Disabling Sysmain will stop the service from preloading applications, which can help reduce disk usage and speed up your PC. However, this method might not be suitable for everyone, as it can affect system performance on older hardware or systems with less RAM.

2. Perform a Disk Cleanup

Disk cleanup is a built-in Windows tool that allows you to remove unnecessary files and free up disk space. This can help reduce disk usage caused by Sysmain. Here’s how to do it:

Step 1: Press Windows + S to open the search bar.

Step 2: Type “Disk Cleanup” and select it from the search results.

Step 3: Choose the drive you want to clean (usually “C:”).

Step 4: Click “OK” to let Windows calculate the space you can free up.

Step 5: In the Disk Cleanup window, check the boxes for the file types you want to remove. You can select items like temporary files, system error memory dump files, and more.

Step 6: Click “OK” and then “Delete Files” to confirm.

Performing regular disk cleanups can help you maintain a healthy and efficient system by eliminating unnecessary clutter that contributes to high disk usage.

3. Optimize Windows Search

The Windows Search feature can sometimes be a contributor to high disk usage. Optimizing it can make a noticeable difference. Follow these steps:

Step 1: Press Windows + S to open the search bar.

Step 2: Type “Indexing Options” and select it from the search results.

Step 3: In the Indexing Options window, click on “Modify.

Step 4: Uncheck the directories that you don’t need to be indexed. You can often exclude system folders or locations with excessive files, such as your Downloads folder.

Step 5: Click “OK.”

Optimizing the Windows Search index ensures that it doesn’t constantly scan and update files, which can reduce disk usage.

4. Update Your Device Drivers

Outdated or incompatible device drivers can lead to high disk usage issues. It’s essential to keep your drivers up to date. Here’s how you can do it:

Step 1: Press Windows + X and select “Device Manager” from the menu.

Step 2: Expand the categories and right-click on the devices, then select “Update driver.”

Step 3: Choose “Search automatically for updated driver software” and follow the on-screen instructions.

Step 4: Repeat this process for all devices that need updating.

Updating your device drivers can improve compatibility and reduce the chances of encountering high disk usage problems.

5. Upgrade Your Hardware

If you’ve tried the above methods and still experience high disk usage due to Sysmain, it may be time to consider a hardware upgrade. Upgrading your RAM or switching to a solid-state drive (SSD) can significantly improve your PC’s performance.

Adding more RAM provides your system with more memory to work with, reducing the need for Sysmain to preload data onto your disk. An SSD, on the other hand, offers faster read and write speeds, which can alleviate disk usage-related issues.


Q1: What is Service Host Sysmain, and why does it cause high disk usage?

Service Host Sysmain is a Windows system process responsible for preloading applications to make them launch faster. High disk usage occurs when it excessively preloads data, causing a slowdown.

Q2: Will disabling Sysmain negatively impact my system’s performance?

Disabling Sysmain may lead to slower application launches, primarily on systems with limited RAM or older hardware. It’s essential to consider the trade-off between faster disk usage and system performance.

Q3: How often should I perform a disk cleanup?

Performing a disk cleanup once a month is a good practice to maintain optimal system performance.

Q4: Are there third-party tools to optimize Windows Search?

Yes, there are third-party applications like “Everything” that can provide advanced search capabilities and help optimize Windows Search.

Q5: What are the benefits of upgrading to an SSD?

Upgrading to an SSD offers faster read and write speeds, resulting in quicker boot times, application launches, and reduced disk usage-related issues.


In conclusion, resolving high disk usage caused by “Service Host Sysmain” is essential for maintaining a smooth and efficient computing experience. By following the five methods outlined in this article, you can tackle this issue and enjoy improved system performance in 2023. Whether you choose to disable Sysmain, perform disk cleanups, optimize Windows Search, update your device drivers, or consider a hardware upgrade, the key is to find the solution that works best for your specific PC configuration.

Remember that not all methods may be suitable for everyone, and it’s crucial to consider the trade-offs between improved disk usage and overall system performance. By implementing these solutions, you can ensure that your PC operates at its full potential, making your daily tasks more efficient and enjoyable. Say goodbye to high disk usage and hello to a faster, smoother computing experience!

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