Service Host SysMain High Disk Usage in Windows 10 (Fixed)

Service host SysMain high disk usage sometimes causes 100% CPU usage that could slow down or freezes the system entirely. Service host SysMain usually remains dormant but when windows require its services, it takes up 100% disk usage causing PC to slow down. Read this article to find out how to fix Service host SysMain high disk usage in Windows 10?

What is Service Host SysMain (SuperFetch)?

SysMain or previously known as SuperFetch is a RAM management system that preload recently used programs for faster service. It was introduced in Windows Vista and they changed the name from SuperFetch to SysMain in Windows 10. It observes the RAM usage pattern in the system and preloads the frequently used apps in the RAM to save time. this will reduce the startup time and help programs to launch faster.

Why Service host SysMain is causing high disk usage?

The SysMain service’s objective is to relocate memory to the preload the program but once we boot up the program, it will still use the same amount of CPU Usage. It constantly uses the system and preload programs which causes Service host SysMain high disk usage in the system.

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Note: Most users with SSD doesn’t require SysMain to preload memory because SSD Drivers are faster (HDD drivers are slow organizer).

How to Fix Service host SysMain high disk Usage in Windows 10?

Stop Service host SysMain Process

We can simply stop the SysMain process and speed up our PC, but there are multiple ways to accomplish this task. The easiest way is to simply end Service host SysMain high disk usage from windows services or from the command prompt. However, sometimes the process stays hidden in the background eating up all the memory. We can stop the service host SysMain process from the registry editor as well. Here are all of the process for stopping SysMain in windows,

Stop SysMain Process from Windows Service

  • Type “services.msc” in Run windows(Windows+R) to open service
  • Then find Service host: SysMain from other services, right click on that and open properties
  • Now in the general tab, near service status, click the stop button

Service Host SysMain High Disk

This will stop the SysMain services and high disk usage in the system. We can stop this service from the Task manager too, just find the Service host: SysMain, right-click on that process and end task.

Service Host SysMain High Disk

Once you stop the services from either one of them, restart your PC to check again for Service host SysMain high disk usage. If you still find the service up and running, try other methods.

Stop SysMain from Command Prompt

  • Open the command prompt as administrator

Service Host SysMain High Disk

  • Now type, “sc stop “SysMain” & sc config “SysMain” start=disabled”
  • This will stop the service and disable it from the startup
  • It will display a message, “Change Service Config Success”
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Service Host SysMain High Disk

Stop SysMain from Registry Editor

  • Open Run windows and type Regedit
  • Then follow this path to find Sysmain
  • Then right-click on the Start option to modify
  • Change the value from 2 to 4 and press ok

Service Host SysMain High Disk

Once you change the values in registry editor, it will stop the SysMain service. Restart your system and check for the Service host SysMain high disk usage in task manager. If you still find them running, try other methods.

Update Windows

Always update your windows with latest update to fix any issue. Sometimes when users face unexpected problems, it could be caused by a buggy update. A new window update could fix those issues with patches and solve the Service host SysMain issue right away.

System Restore

If any of the above methods doesn’t fix the Service host SysMain high disk usage in windows, you can simply restore your system. Windows Operating System provides system restore that can take back the system to a certain date and time (Automatic restore points) and fix the issue right away. Here is the process,

  • Open control panel and select system
  • Now find the system protection option on the left-hand side

Service Host SysMain High Disk

  • It will open system properties, then find the System protection tab
  • Click on the system restore button, select date and time of system restore when SysMain process wasn’t an issue and restore it.

Service Host SysMain High Disk

FAQ for Service host SysMain High Disk Usage

  • What is SysMain?

SysMain is previously known as Superfatch is a RAM management system that preloads programs for faster boot time. In windows 10, it’s named SysMain, from windows vista to windows 8 it was known as SuperFetch and before that, it was prefetch.

  • How to Stop Service Host SysMain High CPU Usage?
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Following methods can fix SysMain high disk usage issue in the windows

  1. Stop SysMain Process from Windows Service
  2. Stop SysMain from Command Prompt
  3. Stop SysMain from Registry Editor
  4. Update Windows
  5. System Restore
  • Is it Safe to Disable SysMain in Windows 10?

Yes, it’s totally safe to disable Service host: SysMain in windows 10. If the user is facing high CPU usage caused by the service, they can disable it and improve PC performance.

Conclusion

Windows has lots of services that run in the background to provide support for the system. But sometimes when some of the services start using more disk space and CPU, it could cause PC to solve down. We have introduced the causes and the fixing methods for the Service Host SysMain High Disk Usage, in this article. If you have any questions about SysMain(SuperFetch), ask us in the comment section.

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