SysMain was previously called Superfetch, and its purpose is to help improve the performance of the Windows operating system. It is a collection of system processes, including Windows automatic updates and other background-running Windows system applications.

However, it's common to face problems when the Service Host: SysMain service is active. Since the Sysmain service is resource-intensive (high disk usage), it might significantly raise CPU usage. If you're using an HDD on your system, you could also encounter the "Service Host: SysMain high CPU and memory" problem. Consequently, you might notice sluggishness in your computer or even PC freezing.

Keep reading to discover how to solve the "Service Host: SysMain high CPU" problem.

Fix 1: Disable Service Host: SysMain

The most effective way to fix the issue is to disable it on Windows 11/10. You can achieve that through the Services application. Follow these steps:

1. Enter services in the Search box to open it. Then, select the Standard category.

2. Next, locate SysMain and right-click it to select Properties.

3. Under the General tab, change the Startup Type to Disabled and press the Apply button.

Fix 2: Perform a Disk Cleanup

A full hard drive can also trigger the "Service Host: SysMain high CPU" problem. Hence, you should conduct a disk cleanup. Two tools are at your disposal – MiniTool System Booster and the Windows built-in cleanup tool. It's advisable to opt for MiniTool software due to its advanced features. Here's how to proceed:

#MiniTool System Booster

MiniTool System Booster is a comprehensive PC optimization tool that can address various issues related to system resource allocation and accelerate CPU, RAM, and hard drive resources. It offers a 15-day free trial version, compatible with Windows 11, 10, 8.1, 8, and 7.

Let's explore how to use it:

1. Launch MiniTool System Booster and navigate to the Deepclean section from the top dropdown menu.

2. Click START CLEAN to execute seven cleanup tasks. These tasks will be carried out sequentially, and it's recommended to initiate Internet Cleanup and Windows Cleanup. For the remaining tasks, you can start them based on your needs or skip any unwanted ones.

3. Additionally, other features can assist in resolving the "Service Host: SysMain high CPU and memory" issue.

Proceed to the Toolbox section from the top menu. Process Scanner under System Management can be used to terminate unnecessary background tasks that waste CPU resources.

Advanced Uninstaller under File Management can help you uninstall unnecessary programs that may cause the "Service Host: SysMain high CPU" issue.

#Windows Built-in Cleanup Tool

Disk Cleanup is the Windows built-in tool that allows you to easily remove certain junk files such as previous Windows installations, Recycle Bin files, temporary files, temporary internet files, etc. Let's see how to perform a thorough cleanup with it.

1. Type disk cleanup in the Search box and choose the best match result.

2. In the resulting window, the system drive is selected by default. Click OK to proceed.

3. You'll then see the total amount of disk space you can reclaim by deleting all files listed in the box.

4. Now, check the files you wish to delete and press the OK button.

5. Finally, click Delete Files to confirm that you want to permanently remove these files.

Fix 3: Run SFC

If you wish to fix the "Service Host: SysMain high disk" issue without disabling SysMain, you can try using the System File Checker (SFC) tool. It is a Windows built-in utility that checks system file integrity. Upon executing the command, it will check and replace any corrupt system files it detects during the scan.

1. Type cmd in the Search box and choose Run as administrator.

2. Copy and paste the following command into the Command Prompt and press Enter:

sfc /scannow

Fix 4: Run a Virus Scan

To resolve the "SysMain high CPU" issue, it's essential to run a virus scan via Windows Defender. Furthermore, it's suggested to disable third-party antivirus software. Here's how to run a virus scan:

1. Press the Windows I keys simultaneously to open Settings.

2. For Windows 10 users, go to Update & Security > Windows Security > Open Windows Security.

For Windows 11 users, go to Privacy & security > Windows Security > Open Windows Security.

3. Navigate to the Virus & threat protection tab, and click the Quick scan option.

Fix 5: Replace Hard Drive with SSD

To address the "Service Host: SysMain high CPU" issue, you might consider upgrading to a solid-state drive (SSD) if your PC still employs a traditional hard drive, as this can greatly boost the PC's performance.

SSDs are faster, more reliable, and offer quicker data access compared to conventional hard drives. For further details, refer to this article – SSD Upgrade: How to Upgrade SSD for Your Computer.

Final Thoughts

How to fix the "Service Host: SysMain high CPU" issue on Windows 11/10? Now you have several practical tips to try from this post. I hope this guide proves beneficial to you.

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