Fix: Sysmain High Disk Usage

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Fix: Sysmain High Disk Usage
Sysmain High Disk Usage

Community forums are now filled up with a number of questions related to Windows PC’s traditional hard disks. This issue is due to SysMain high disk usage.

The most common symptom for service host SysMain’s high disk usage is the activity percentage which goes up to 100%. And this is why your system slows down to even unworkable conditions.

Through this guide will let you know the reason behind the SysMain disk usage issue happens what are different ways to fix this and ways to control it along with other related details like service host: SysMain high usage issue,

Let’s dig deeper!

Why Does This Sysmain Service Windows 10 Issue Occur?

HDD, known as the traditional hard disk storage device is what leads to this SysMain disk issue. HDD is much slower than the recently adapted SSD (Solid State Drive).

It becomes difficult and extra intensive for HDD to continuously set up your disk. With repeated efforts by HDD to get back on the stable state Windows Superfetch disk usage goes extremely high.

Fix: Sysmain High Disk Usage
Why Does This Sysmain Service Windows 10 Issue Occur

To keep things in the right order it becomes important to know everything about why is Superfetch using 100 disk and how to control it. For this, we have some best and proven options available.

So, start rolling your eyes to know What Are The Different Ways To Control Superfetch High CPU Usage?

Ways To Control Superfetch High Cpu Usage?

There are different ways available to control and even remove those internal causes which lead to Superfetch slowing down computer issues.

Below we have listed some most common and proven ways to do this-

Method 1. Using Windows Services Manager Disable Sysmain-

Windows Services Manager can be used for any system-related adjustments and changes. You can even disable SysMain using your Windows Services Manager.

  • First, open your Windows Run dialogue box. For this press Windows+R keys.
  • In the Run dialog box, just input the text: Services.msc and then click OK.
  • Now, from the popped list locate SysMain, for this just scroll through the services list.
  • Right-click on the SysMain option and from the popped menu select Properties.
  • In the SysMain Properties locate the Service status section. Here click on the Stop button to disable SysMain service.
  • Now, open the drop-down menu, by clicking under the Startup type setting. From the drop-down menu select Disabled.
  • Lastly, click apply and then press OK to save the changes.

Done! SysMain will now stop and won’t be able to launch on system startup. Make sure you restart your computer before using it.

Method 2. Using Command Prompt Disable Sysmain-

You can disable the SysMain service running in your system using the command prompt. This is quite simple and the easiest way. Here’s how you can do it-

  • First, open your Run dialog box by simply pressing the Windows+R key.
  • In the open Run box, type CMD and hold Shift+Ctrl+Enter keys. This command will open the elevated Command Prompt.
  • In the Command Prompt window, just type input the following commands: sc stop “SysMain” & sc config “SysMain” start=disabled or net.exe stop superfetch.
  • To save your choice just press the Enter key.

Note- You should get a ChangeServiceConfig SUCCESS message after you disable the SysMain using your command prompt.

Now, you have to Close the Command Prompt. After that open your Windows Task Manager and check if disk/CPU usage has gone down or not.

Fix: Sysmain High Disk Usage
Ways To Control Superfetch High Cpu Usage
Method 3. Using Registry Editor Disable Sysmain-

The registry editor can be used to disable SysMain/Superfetch. For this, just follow the steps below-

  • First, hold down Windows+R keys. This will open your system Run box.
  • Using this Run dialog box you can open the Registry Editor by simply typing Regedit and then press OK.
  • After this, your Registry Editor will open up, here you have to navigate: KEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SysMain
  • Once you find it, just click on Start present in the right pane and select Modify.
  • You will be asked to input Value in the data text box, just type 4 here.
  • To save your modification simply click OK and save the changes.

Done! Now, you have to close the Registry Editor from the background. After that open your system Task Manager Superfetch and check whether the disk/CPU usage has gone down or not. If not then try method 4.

Method 4. Update Windows-

Sometimes an outdated version of Windows can cause this Superfetch 100% disk usage issue and updating your Windows will fix it.

Microsoft timely brings updates for smooth functioning of the system with stability and fix any bug highly complained about.  

Updating your Windows will even optimize system performance and it’s again the easiest way to fix this high disk usage issue.

Here’s how you can update your Windows-

  • First, move to your home window and then right-click on the Start Menu button. From the menu popped select Settings.
  • In settings look for Update & Security and then click it.
  • This will direct you to the available system updates check, to check click on Check for updates option.
  • If Windows finds any update available for your system then click the Install now button.
  • Now, you have to wait for Windows to complete the download and installation process. 
  • After successful installation, Restart your system for smooth access.

Note- You will be asked- Restart now when prompted, while downloading, simply allow this.

That’s all about service host Superfetch high CPU usage issue and how to lower disk usage windows 8.1/10/11.

Now, just have a look at some questions from SysMain high disk usage Reddit community forum-

Frequently Asked Questions-

  • Is It OK To Disable Sysmain?

It’s better to leave SysMain/Superfetch running if you aren’t facing any performance issues.

But in case you see high hard drive utilization, poor performance or constant memory issues then it’s advisable to disable your  Superfetch and check back whether it resolves the issue or not.

  • Why Is Sysmain Using All My Disk?

If you are confused about why is SysMain using 100% disk even though you haven’t allowed it then it’s because SysMain is a service that runs in the background and goes on scanning your computer behavior.  It performs its scan on the hard disk level.

  • Why Is Sysmain So High?

SysMain/Superfetch starts using your system too many resources and this is how you get the track of storage usages of running software in your pc. But running the background and scanning every file leads SysMain to get even up to 100%.

  • How Do I Reduce Sysmain Disk Usage?

To reduce SysMain disk usage you can simply disable SysMain from running background. For this, you can use any of the below-listed methods-

Method 1. Using Windows Services Manager Disable SysMain

Method 2. Using Command Prompt Disable SysMain

Method 3. Using Registry Editor Disable SysMain

Method 4. Run Windows Update

We already have discussed each one of these methods in detail above.

  • Does Anything Happen When Sysmain On Or Off For Gaming?

Well, when you want to have smooth and interruption-free gaming on your HDD-supported system you can tune off or disable your SysMain. But if your system supports SSD and unusually you feel any lag or slowdowns you can leave SysMain running.

  • How To Enable Sysmain?

To enable SysMain on your computer you can use the administrator mode. Just input the given commands: Enable: sc config “SysMain” start=auto & sc start “SysMain.”

For Disable: sc stop “SysMain” & sc config “SysMain” start=disabled. This input will simply work as service host SysMain end task command request and disable your SysMain from running at the back-end.

Final Words-

SysMain high disk usage indicates to you that your system is getting unworkably slow and immediate action is required. We hope this complete guide helped you out with all possible ways to control this service host Superfetch high CPU usage issue.

If you are still confused with anything like its cause or fixing methods, just go through the read once again and let us know in the comments too.

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