Fixed: SysMain High CPU and Memory Usage in Windows 10

SysMain, formerly known as SuperFetch, is a Windows service that is designed to improve system performance by preloading frequently used applications into RAM. However, in some cases, it may lead to high CPU and memory usage, causing performance issues. Here are steps you can take to address SysMain high CPU and memory usage in Windows 10:

Method 1: Disable SysMain Service

1. Open Services:
   • Press Win + R to open the Run dialog.
   • Type services.msc and press Enter to open the Services window.
2. Locate SysMain (SuperFetch):
   • Scroll down to find the “SysMain” service. It might still be labeled as “SuperFetch” in some versions of Windows.
3. Right-Click and Stop the Service:
   • Right-click on “SysMain” or “SuperFetch” and select “Stop” to temporarily stop the service.
4. Set Startup Type to Disabled:
   • Right-click on the service again, choose “Properties,” and set the “Startup type” to “Disabled.”
   • Click “Apply” and then “OK.”

Method 2: Clear Prefetch Data

1. Open Run Dialog:
   • Press Win + R to open the Run dialog.
2. Type Prefetch:
   • Type %SystemRoot%\Prefetch and press Enter to open the Prefetch folder.
3. Delete Contents:
   • Delete all the files in the Prefetch folder. These files are used by SuperFetch to optimize application launch times.

Method 3: Update Windows and Drivers

1. Update Windows:
   • Make sure your Windows 10 installation is up to date. Microsoft often releases updates to address performance issues.
   • Go to “Settings” > “Update & Security” > “Windows Update” and click on “Check for updates.”
2. Update Device Drivers:
   • Outdated or incompatible drivers can cause performance issues. Update your graphics card, network, and other drivers to the latest versions.

Method 4: Check for Malware

1. Run a Full Antivirus Scan:
   • Perform a thorough antivirus scan to check for any malware or unwanted software that might be causing high CPU and memory usage.

Method 5: Use Windows Performance Troubleshooter

1. Open Settings:
   • Go to “Settings” > “Update & Security” > “Troubleshoot.”
2. Run the Windows Performance Troubleshooter:
   • Select “Windows Update” and run the troubleshooter.

Method 6: Check for Disk Errors

1. Open Command Prompt as Administrator:
   • Right-click on the Start button and select “Command Prompt (Admin).”
2. Run CHKDSK:
   • Type chkdsk /f and press Enter. If prompted to schedule a scan on the next restart, type Y and press Enter.
3. Restart Your Computer:
   • Restart your computer to allow CHKDSK to check and repair disk errors.

After trying these methods, monitor your system to see if the SysMain (SuperFetch) service continues to cause high CPU and memory usage. If the issue persists, you may need to consider more in-depth troubleshooting or seek assistance from Microsoft support.