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. I noticed it when my laptop become unresponsive and after investigating I found that sysmain is taking up the high resources. Sometimes it resolved automatically but any point it again become unresponsive. So I researched and find out the facts about this 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 & CPU 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. Before going further first lets know about the Sysmain service in Windows 10.

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 start 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.

So what it does and should you disable it?

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 a required service but is just for optimal performance of the system. If you want to disable it you can do it safely. In my computer after deactivating it I didn’t found any performance difference. But I got positive result that now it is now slowing down my system in between work. So lets see how you can disable this service.

How to Disable 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

Though after deactivating it there should be possibility it might reactivated again when you got new Windows updates. So we need to disable it again. Then I tried to find out a permanent solution for this issue. And below are some steps which fix my issue without disabling it.

How to Fix Superfetch / Sysmain 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


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