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How to Start/Stop Superfetch

Service name: SysMain

Display name: Superfetch


Maintains and improves system performance over time.

Path to executable:

C:\WINDOWS\system32\svchost.exe -k LocalSystemNetworkRestricted -p

This method shows you how to Start/Stop Superfetch service from Command Prompt

Perform the following steps:

Please go to Start and click on the Type here to search

Type cmd, right click on cmd icon under the Programs and click on Run as administrator

Services Regedit CMD Msconfig

Please confirm User Account Control pop-up

Please select, right and copy a registry key from below, then right click on command prompt window, select Paste and press Enter

To Start Superfetch service:

net start SysMain

sc start SysMain

Note: You can’t start a service if Startup type is on Disabled.

To Stop Superfetch service:

net stop SysMain

sc stop SysMain

To change Startup type:


REG add "HKLM\SYSTEM\CurrentControlSet\services\SysMain" /v Start /t REG_DWORD /d 2 /f

sc config SysMain start= auto


REG add "HKLM\SYSTEM\CurrentControlSet\services\SysMain" /v Start /t REG_DWORD /d 3 /f

sc config SysMain start= demand


REG add "HKLM\SYSTEM\CurrentControlSet\services\SysMain" /v Start /t REG_DWORD /d 4 /f

sc config SysMain start= disabled

Automatic (Delayed Start):

REG add "HKLM\SYSTEM\CurrentControlSet\services\SysMain" /v Start /t REG_DWORD /d 2 /f

sc config SysMain start= delayed-auto

Note: When you change to Automatic (Delayed Start) a new key DelayedAutostart is created with value 1.

REG add "HKLM\SYSTEM\CurrentControlSet\services\SysMain" /v DelayedAutostart /t REG_DWORD /d 1 /f

When you change to Automatic from Automatic (Delayed Start), DelayedAutostart change value to 0.

REG add "HKLM\SYSTEM\CurrentControlSet\services\SysMain" /v DelayedAutostart /t REG_DWORD /d 0 /f