How to Fix the Service Host SysMain High CPU Issue on Windows

If your computer suddenly shows performance problems and starts to run slowly, a process is likely causing high disk usage.

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The service host SysMain (formerly known as Superfetch) is a system process package that contains multiple processes. You can find the SysMain service on the System 32 folder. The SysMain process is responsible for collecting various usage data on the system. This data will then be reorganized into your hard drive in blocks and prioritized accordingly.

Now, let’s see how to fix the Service Host SysMain issue. The best method for you to fix the Service Host SysMain 100 disk issue is to disable it on Windows 10. Before you try to disable it, you can try the following solutions.

1. Run SFC
2. Upgrade HDD to SSD
3. Update your Windows system
4. Run disk cleanup tool

If these methods are not working, you can try to disable Service Host SysMain.

How to Disable Service Host SysMain

There are 3 ways available – via Service, Command Prompt, Registry Editor.

Disable Service Host SysMain in Service

You can try to disable Service Host SysMain in Services. Here is how to do that:

Step 1: Type services in the Search box to open it. Then, you need to click the Standard category.

Step 2: Then, find Service Host SysMain and right-click it to choose Properties.

Step 3: Under the General tab, you need to change the Startup Type to Disabled and click the Apply button. Then, you have disabled Service Host SysMain Service successfully.

Disable Service Host SysMain in Command Prompt

You can also disable Service Host: SysMain in Command Prompt.

Step 1: Type cmd in the Search bar, then right-click the first result to choose Run as administrator.

Step 2: Type the following command and press the Enter Key:

sc stop “SysMain” & sc config “SysMain” start=disabled

Step 3: Then, you will receive a message – Change Service Config Success.

Then, the SysMain service has been disabled and the Service Host SysMain high disk issue should be fixed.

Disable Service Host SysMain in Registry Editor

Then, you can choose to disable Service Host SysMain in Registry Editor. Follow the steps below:

Step 1: Press the Windows + R keys at the same time to open the Run dialogue box. Then, type regedit in it to open the Registry Editor.

Step 2: Navigate to the following path:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SysMain

Step 3: In the right pane, right-click Start and select Modify.

Step 4: Enter 4 in the Value data box and click OK.

Close the Registry Editor and restart your computer. Then, you have disabled Service Host SysMain successfully.

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Final Words

To sum up, to solve the Service Host SysMain issue, this post has shown 3 reliable methods to disable it. If you come across the same error, try these solutions. If you have any better idea to fix it, you can share it in the comment zone.