Service Host SysMain causing High CPU and Memory usage in Windows 11/10

Superfetch or SysMain is many times known to escalate the CPU usage to very high levels, so that the efficiency of other processes goes low. However, it is not something that is necessary for a computer. Found in the System32 folder, it helps to maintain and improve system performance over a period of time. 

In simple words, as you use your computer, it will recognize the data that is used, then organize it into blocks for the hard disk, and then prioritize such blocks as it seems right based upon usage statistics. 

Therefore, before going for a straight away disable, we can try the following solutions:

  • Run the System File Checker
  • Repair the System Image
  • Go for the Disk Cleanup Tool
  • Troubleshooting in the Clean Boot State   

If the above does not solve your problem, and you decide to disable the SysMain service, to improve CPU efficiency for other processes, you can do the following. 

Method 1: Use the Service Manager to Disable the SysMain service

For this follow the below steps:

  1. Go to the Run window by pressing “Windows+R”
  2. Type the command “services.msc” and enter.
  3.  Reach the SysMain Service by scrolling down the list. 
  4. Now make a change to the “Startup Type” as Disabled.
  5. Apply and OK.

TIP: If you are facing System related issues on Windows like registry errors or System files being deleted by virus or System crashes like us, we recommend downloading Restoro software which scans your Windows PC for any issues and fixes them within a few minutes.

Method 2: Use the Elevated Command Prompt to Disable the SysMain service

This method is considered much easier by many users and involves a lesser number of steps. For this:

  1. Type Command Prompt in the Windows Search bar.
  2. Go to the right-hand side pane corresponding to the command prompt, and then select “Run as administrator”.
  3. Command Prompt shall open. 
  4. Execute this command “sc stop “SysMain” & sc config “SysMain” start=disabled”
  5. Wait for the success message to appear.
  6. Restart the computer. 

Method 3: Use the Registry Editor to Disable the SysMain service

This method is considered good for making long-term changes to a computer. For this do the following.

  1. Go to the Run window by pressing “Windows+R”
  2. Type the command “regedit” and enter.
  3. Registry Editor window shall open. 
  4. Go to “HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SysMain”.
  5. On the right pane, you will find the value “Start”. Double-click on that. 
  6. Now change the value of Value Data to 4.
  7. Press OK and this shall save these recent changes that you have made. 
  8. Restart your Computer system.

Hopefully, the above resolutions helped you in fixing the problem of high resource utilization problem. You can always try for the next method, out of the three above, if one does not help. 

Service Host SysMain Frequently Asked Questions

Is it fine to disable the SysMain Service in Windows?

Normally, when you open some application, the executable file is copied into the memory so as to run it. And when you close the application, the program shall still exist in the RAM, from where it can be fetched very quickly when you restart the application. However, if the SysMain Service is disabled, which is related to Superfetch, this would not be possible and your application might need some extra time to open.

Why is SysMain using so much disk?

SysMain program will show high disk usage in Windows 10 and Windows 11 scans your hard disk continuously to find out which programs and files you are using often and to speed up that process.

I hope you were able to disable and learn more about the Service Host SysMain with the help of our tutorial.

Also let us know in the comments below if you are facing any issues.

About The Author: Gowtham V is a tech blogger and founder of who is an expert in Technology & Software and writes awesome How-To Tutorials to help people online. He has 5 years of experience in creating websites and writing content. He uses a Windows PC, a Macbook Pro, and an Android phone. Check out more about our website and our writers on our About US page. Also follow me on Twitter page and Linkedin

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