What Is Sysmain & How To Turn It Off?

Superfetch or Sysmain is a process of Windows that has had various names throughout the years. On Windows XP we call it Prefetch. Superfetch was launched in Windows Vista, and on the new models of Windows 10, it’s now known as Sysmain.

However, the aim of every generation of Superfetch has been the same. The aim is to improve the performance of Windows after preloading applications you use frequently into RAM before you want to use them. But what do you know about Superfetch?

Working Of Superfetch (Sysmain)?

Working Of Superfetch

In the new model of Windows 10, the Superfetch service now displays up at the bottom of the name SysMain. From the Task Manager, it displays as Service Host: SysMain.

If you’re executing an older model of Windows 10 or any variant of Windows 7 or 8, this will display up in the Task Manager as Service Host: Superfetch.

However, the service executes in the background and examine how much RAM you’re using and what applications you execute most frequently. Any applications the service recognizes as “frequently used”, it’ll initiate preloading the app into RAM. This way, the next time whenever you execute the app, it’ll launch much very fastly.

You may be concerned that it means Superfetch is using all of your RAM, but it isn’t. The service concerns pre-loading applications into spare RAM. As it can’t register as consumed memory. You’ll view this whenever you open Task Manager to the Processes tab and view your Memory usage.

Also, though Superfetch consuming all spare RAM with preloaded applications. Also, it consumes all RAM usage still doesn’t show 100%. This is due to Superfetch is executing in the background, and it’ll launch any spare RAM it’s using whenever you want to use that memory for many other active tasks.

Do You Want To Kill Superfetch (Sysmain)?

Generally, you don’t want to stop Superfetch from executing. It uses a very minuscule amount of CPU, and it also uses spare RAM.

However, some reports claim throughout MS user forums that certainly the Superfetch (Sysmain) process causes performance. Some of these reported problems include:

  • 100% disk utilization.
  • Overheating leading to PC shutdown.
  • Slow bootup time whenever you start your PC.
  • On weak hardware, Superfetch can use lots of CPU and RAM than you might like.
  • Cause performance problems while gaming.

Some common issues people report is the 100% disk utilization problem. If this is you, then turning off Superfetch or Sysmain might fix the issue.

However, Superfetch is a feature of system optimization. You can’t hurt Windows after stopping the service. However, you might notice that launching your most favorite applications might take a little longer than usual.

How To Turn Off Superfetch In Windows 10

Is it safe to turn off Superfetch?

How To Turn Off Superfetch In Windows 10

If you aren’t facing performance problems or other issues, it’s the best idea to leave Superfetch (Sysmain) running. It is an essential process that cuts down on the time it takes whenever you launch programs that you frequently use.

However, if you are facing high hard drive utilization, constant memory problems, or whole poor performance, you can try turning off Superfetch to view if it fixes the issues. If it does, then leave the service turned off. Alternatively, enable it again and continue troubleshooting.

To turn off Superfetch (Sysmain) on Windows 10:

  1. Choose the Start menu, input services, and choose the Services app. You can also hit Windows + R, input services.msc, and hit Enter.
  2. From the Services app, move down to SysMain, right-tap on the service, and choose Stop. If you’re executing an older variant of Windows, right-tap on the SuperFetch service and choose Stop.
  3. Now you want to safeguard the service from restarting when you initiate Windows. When the service is stopped, right-tap on the service again and choose Properties.
  4. From the Startup type dropdown, choose Disabled.

Now the SuperFetch (SysMain) service is turned off permanently and can’t restart the next time you initiate your PC.

Turn Off Superfetch (Sysmain) With Registry Editor

Another option to use Task Manager to turn off Superfetch on Windows 10 is using the Registry Editor.

Before you initiate doing anything inside the registry, make sure you take a complete backup of the registry first, just in case anything went wrong.

When you’re ready:

  1. Choose the Start menu, input regedit, and choose the Registry Editor app.
  2. From the Registry Editor, head over to HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Control > Session Manager > MemoryManagement > PrefetchParameters.
  3. From this section, you should then view a key known as EnableSuperfetch. Right-tap this key and choose Modify.
  4. From the Edit DWORD window that appears, modify the Value data field to 0 and choose OK.

You can also quit the Registry Editor when you’re finished.

This registry entry will turn off the SuperFetch (SysMain) service on your PC. However, you might want to restart your Windows before this registry setting takes effect.

Turn On Or Off SuperFetch (SysMain) Via Command Prompt

Turn On Or Off Sysmain Command Prompt

If you want to work with the command prompt, there are some easy commands you can use to turn on or off the SuperFetch service.

Head over to the command prompt in administrator mode first, and then use the following commands:

  • Enable: sc config “SysMain” start=auto & sc start “SysMain”
  • Disable: sc stop “SysMain” & sc config “SysMain” start=disabled

Note: If you’re using an older variant of Windows. You can then replace “SysMain” with “SuperFetch” in the commands above.

If you want to use PowerShell, then open it with administrator rights and use the given commands:

  • Enable: Set-Service -Name “SysMain” -StartupType Automatic -Status Running
  • Disable: Stop-Service -Force -Name “SysMain”; Set-Service -Name “SysMain” -StartupType

This approach can be very fast and simpler than tapping around in the Task Manager or the Windows registry.

What Happens If This Doesn’t Fix The Issue?

If turning off SuperFetch (SysMain) doesn’t fix your problem. Then there might be something else that causes the problem.

If you’re still having 100% disk utilization, you might want to upgrade to a bigger hard drive, or you have a chocie to upgrade to an SSD drive. SSD drives are very cheap now and have data-transfer rates too much above than older hard drives.

If you’re encountering CPU utilization problems, then discover other CPU troubleshooting steps to fix the culprit that’s consuming all of your CPU resources.


Having complete knowledge of computers is not enough for everyone. You must know which program and application are running on your PC or is it harmful or not. So, our guide focus on the complete overview of Superfetch. I hope you understand it very well. If you still have any queries and questions let us know below!

Also Read:

Leave a Reply

Your email address will not be published. Required fields are marked *