What is Superfetch or SysMain ? How to disable it? How to fix it?

If your games are lagging, computer responding very slow, showing high disk / CPU usage then it could be due to the issue with the SysMain or Superfetch service. See how you can disable this service or fix this issue.

Service host superfetch / SysMain consuming memory and disk usage.
Screenshot of supfetch service consuming almost all disk space and high memory usage

This service may also create the 100% disk issue. So disabling or fixing the issue related the Superfetch may also fix the 100% disk usage issue as well.

What is Superfetch or SysMain?

Superfetch or SysMain is a legitimate Windows 10 service. Though this service is to speed up the apps but some times it starts creating issues to some users like high CPU usage and high disk usage. In Windows XP it was known as the Prefetch service and in Windows vista it was renamed to Superfetch. Actually both services are same. In Windows 10 After 1809 update it was renamed to SysMain but the thing is same.

Sp what it does? Actually it learns the user’s system usage pattern and efficiently manage the system for faster loading of apps and faster boot time. It is not necessary in the system but it is just for optimal performance of the system. If you want to disable it you can do it safely.

How to Disable Superfetch or SysMain Service?

Here is a quick method to disable this service from the Windows 10.

  1. Type services in the search box on task bar.
  2. Click on the services.
  3. Double click on the Superfetch or SysMain service. Or right click and select properties.
  4. Set the startup type ‘Disabled‘. And also click on the Stop button the stop the service immediately.

If you are unable to locate the Superfetch then look for SysMain as it was renamed in October 2018 update of Windows 10. Search for both the services and disable which ever you find.

Disable SysMain service

How to Fix Superfetch service issue?

Below steps can be useful to fix this issue permanently without disabling it. Because disabling a Windows inbuilt feature in not recommended.

  • Update Windows: Installing all the latest Windows updates may fix many of the Windows 10 issues.
  • Update all device drivers / software and games.
  • Run a PC optimizer to fix any registry related issue or any other configuration issue.
  • If nothing else work you can also try Resetting Windows
Q: Is sysmain is a virus?

A: No, actually it is a legitimate service of Windows. So normally it is not a virus but there may be rare possibility that it is being controlled by a malware if an antivirus software is not installed in the system.

Q: If Service host Superfetch is useful then why it creates problem?

A: There are many different reasons which may create issue with the Superfetch service. It may be due to the driver incompatibility, software incompatibility or stuck in a loop in pre loading of data. Service is creating problem but sometimes due to the incompatibility with the third party apps / games result the issues. Updating the Windows, drivers and apps may fix the issue.

Q: Is it safe to disable it?

A: Yes it is completely safe to disable this service. You can enable it again at anytime. Actually this service is just to optimize the system performance and not a required service. Windows will work smoothly even without this service. This service is for faster performance but if it is making the performance worse then there is no harm in disabling it. But we recommend you to fix the issues and keep this service ‘on’ if it is not annoying you frequently. Hopefully Microsoft will fix these issues in its latest Windows 10 updates.

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