svchost.exe Service Host Sysmain 100% Disk

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If your games are lagging when you play them, if your computer responding is really slow, and if it is showing a high disk, then it could be due to the problem with the Sysmain or Superfetch service. This one may also create the 100% disk issue, so disabling or fixing the issue related to the Sysmain may also fix the 100% disk usage issue as well. Here is the fix that you can try.

There is a quick method to disable the Sysmain from Windows 10. First of all, type “services” in the search box on the task bar. Then, click on the services. Next, double click on the Superfetch or Sysmain service. Aside from that, you can also right click and choose Properties. When it is done, set the startup type Disabled. Do not forget to also click on the Stop button to stop the service immediately. In case you cannot find the Superfetch, then look for Sysmain as it was renamed in the October 2018 update of Windows 10. Feel free to look for both the services and disable whichever you discover.

You can try these following steps to fix the Sysmain service issue permanently without disabling it. Actually, disabling a Windows inbuilt feature is not recommended, so please try these methods instead:

  • Update Windows: Installing all the newest Windows updates may be effective to fix many of the Windows 10 issues.

  • Update all device drivers or software and games.

  • Run a PC optimizer to solve any registry related to the issue or any other configuration issue.
  • If no one works, you can also try resetting Windows.


If you want to update Windows 10 manually, you will have to choose the Start (Windows) button from the bottom left corner. Then, go to settings, the one with the gear icon. Next, choose the Update and Security icon. After that, select the Windows Update tab located in the sidebar. This one is circular arrows. Once you find it, choose Check for updates. If the newest update is available, it will start downloading immediately. In case you do not see anything, do not be panic, this page will tell you if your hardware is currently incompatible. You may see a message saying that the Windows 10 update is on its way and they are offering this update to the compatible devices but yours is not ready for it. They add that when your device is ready, you will be able to see the update available on this page. At that time, there is nothing that you can do.

If you feel really frustrated trying all the methods but no one works for you, you can reset your Windows 10. To do so, navigate to Settings by clicking the gear icon on the Start menu. When you are there, choose Update & security. The next thing is to click Recovery in the left pane. There are three options presented by Windows. The first one is Reset this PC, the second one is Go back to earlier build, and the third one is Advanced startup. Restarting your PC is the perfect option that you can choose for starting fresh. If you are curious about the other two, Advanced startup allows you to boot off a recovery USB drive or disc and Go to an earlier build is made for the Windows Insider who wants to return to the previous version of the OS. The fifth step is to click Get started located under Reset this PC. Feel free to click either Keep my files or Remove everything. If you choose Remove everything, you will face two options to choose: Just remove my files or Remove files and clean the drive. Please click Next if Windows warns you that you will not be able to return to a prior version of the OS. Then, click Reset when prompted. Doing so will restart your Windows. When prompted, please click Continue.

Sysmain, which was used to be called Superfetch in Windows Vista and Prefetch in Windows XP, refers to a legitimate Windows service. Even though this service has a function to speed up the apps but sometimes, it starts causing issues to some users. One of the issues is high CPU usage and high disk usage.

So, what does the Sysmain do? It learns the system usage pattern of the user and efficiently manages the system for faster loading of the apps and faster boot time. It actually is not really important in the system but it is needed for the optimal performance of the system. You can do it safely if you want to disable it.

Is Sysmain a virus? No, it is not. As stated before, it is a legitimate service of Windows. This one is not considered as a virus but there may be a rare possibility that it is being controlled by a malware if an antivirus software is not installed in the system.

If the service host Sysmain is useful, then why does it cause issues? There are some different reasons that may cause issues with the Sysmain service. The occurrence of the issue may be due to the driver incompatibility, software incompatibility, or stuck in a loop in pre loading of data. This service is causing an issue but sometimes it happens due to the incompatibility with the third-party apps or games resulting in the issues. Updating the Windows, drivers, and apps may be worth it to fix the issue.

Is it OK to disable the Sysmain? Disabling the Sysmain is completely fine. You are able to enable it again anytime you want. As mentioned earlier, this service is just to optimize the system performance and not a required service. Windows does not really need it and will still work well even without this one. It is to accelerate the performance but if it is making the performance worse than it is allowed to be disabled. If it is not bothering you frequently, you are recommended to fix the issues and keep this Sysmain on.

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