How to Disable Unneeded Superfetch Windows Service in Windows 10 OS

Superfetch, also known as SysMain, is a Windows service that aims to improve system performance by preloading commonly used programs into memory. However, Superfetch can sometimes cause problems like high CPU/RAM usage and slowdowns, especially on older hardware. Here’s a guide on how to safely disable Superfetch if it’s causing issues on your Windows 10 computer.

What is Superfetch/SysMain?

Superfetch has been a part of Windows since Vista. It monitors which applications you use frequently over time and preloads these into memory so they launch faster when you open them again later.

The idea is that Superfetch learns your usage patterns to optimize system performance. However, if you have an older or underpowered machine, all that background monitoring can tax your hardware and cause slowdowns.

When to Disable Superfetch

You may want to disable Superfetch if:

  • Your computer feels sluggish despite having decent specs
  • You notice high CPU or RAM usage even at idle
  • Programs take longer than usual to open
  • Your hard drive is grinding a lot

Disabling Superfetch typically helps in these cases. Just remember it’s meant to improve performance, so disable it only if you’re sure it’s causing problems.

How to Disable Superfetch

There are a couple methods to disable Superfetch. The easiest is using the Windows Services utility:

Via Services Utility

  1. Press Windows key + R to open the Run dialog
  2. Type services.msc and click OK
  3. Find the SysMain service, right click it and select Properties
  4. From the Startup Type dropdown, select Disabled
  5. Click Stop to stop the currently running service
  6. Click Apply, then OK to save the changes
  7. Restart your PC

And that’s it! Superfetch is now fully disabled. This change can help free up system resources being used by the background service.

Via Command Prompt

You can also disable Superfetch from an admin Command Prompt:

  1. Search for Command Prompt, right-click it, and select Run as administrator
  2. Type the following commands:
   sc stop SysMain
   sc config SysMain start=disabled 
  1. Restart your computer

This achieves the same effect of stopping the service and preventing it from starting again.

Re-Enabling Superfetch

If disabling Superfetch doesn’t help or you change your mind later, re-enabling it is easy:

  1. Open the Services utility again
  2. Find SysMain, open its Properties, and set Startup Type to Automatic
  3. Click Start to start the service again
  4. Click Apply and OK
  5. Restart your PC

And Superfetch will be up and running once more.


Superfetch can slow down older or weaker hardware as it works constantly in the background to analyze usage patterns and preload apps. Disabling it forces Windows to use system resources normally instead.

If your computer seems sluggish, try disabling Superfetch with the steps above to see if it helps performance. Just remember to turn it back on if you don’t notice improvements afterwards.

Let me know if you have any other questions! I have over 10 years of experience optimizing Windows performance and would be happy to help.