How to Disable SysMain to Speed Up Windows PC

Is your Windows 11 PC running slower than usual?

One commonly overlooked setting that will affect your PC performance is SysMain (previously known as SuperFetch). This particular service helps Windows systems perform better by pre-loading frequently used applications into memory (RAM). But, in some cases, mostly older PCs or systems that depend on hard disk drives (HDD), SysMain could be the reason why your computer is experiencing high disk activity, lag, slow boot times and, in general, poor performance.

I will provide a detailed guide on how to disable SysMain and how this action can resolve high disk and CPU usage on your Windows 11 PC, step by step.

Method 1: Disable SysMain via Services

Step 1: Press Windows + R to open the Run dialog box. Type services.msc and press Enter.

Step 2: In the Services window, scroll down to find SysMain.

Step 3: Double-click SysMain to open its properties window or alternatively right-click on Properties to open SysMain.

Step 4: Click the Stop button to halt the service immediately.

Step 5: Under the Startup type dropdown, choose Disabled.

Step 6: Click Apply and then OK to save your changes.

When you restart your PC, SysMain will no longer run in the background.

Method 2: Disable SysMain via Command Prompt

Step 1: Press Windows + R, type cmd in the Run box, and press Ctrl + Shift + Enter to run Command Prompt as administrator. Alternatively, search for cmd, right-click, and select Run as administrator.

Step 2: Enter the following command :

sc stop “SysMain” & sc config “SysMain” start=disabled

This command immediately stops the SysMain service and disables it from running at startup.

Method 3: Disable via Registry Editor (For Advanced Users)

Step 1: Press Windows + R, type regedit in the Run Box, and press Enter to open the Registry Editor.

Step 2: Go to the following path in the left sidebar:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SysMain

Step 3: In the right pane, double-click the Start value. Set the Value data to 4 ( (which disables the service) and click OK. This will disable the SysMain service at the system level.

Step 4: Click OK and restart your PC

Please Always back up your registry before making any changes.

How SysMain Can Impact System Speed and Stability

While SysMain is designed to enhance system performance and speed up your system by preloading apps, it can sometimes do more harm than good on older or low-spec computers. If you own one of these, you may notice your disk usage reaching 100%, slow boot times particularly if you’re using a regular hard drive higher memory consumption, and overall lag when attempting to multitask. These problems are most common on devices with limited RAM, older and less powerful CPUs, or hard disk drives.

If you are using the latest computers with Windows 11 that uses SSDs and 8GB or more of memory, it operates normally in the background without causing any problems. However, older PCs or those with traditional hard disk drives and limited memory might find it ineffective. It may do more harm than good to older PCs.

Should You Keep SysMain Running or Disable It?

If you are using the latest computers with Windows 11 that uses SSDs and 8GB or more of memory, it operates normally in the background without causing any problems. However, older PCs or those with traditional hard disk drives and limited memory might find it ineffective. It may do more harm than good to older PCs.

When to Consider Disabling SysMain :

When CPU usage stays near 100%, particularly on HDD systems.
Your PC is slow or lags when you launch applications.
Memory usage is unusually high, and you have limited RAM.

Why It Depends on Your System hardware :

The effectiveness of SysMain depends heavily on your system hardware configuration:
It often has minimal impact and can be left enabled, particularly on modern PCs that have SSD hard drives and more than 8GB of RAM.
If you disable SysMain on older PCs, it can free up system resources and help your system run more smoothly.
Use the above recommendation, enabling or disabling for the performance on the PCs. Perform the same steps to re-enable after monitoring and testing.

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Final Thought : Disable SysMain on Windows PC

Disabling or adjusting the SysMain feature can be useful but is not always necessary, particularly on SSDs. Disabling it may reduce background activity and improve responsiveness, especially on older PCs or hardware. If you update your Windows when it needs and consider upgrading your hardware to the latest technology, it can further enhance your PC’s performance, speed, or security. Fortunately, disabling SysMain is easy, reversible, and often effective for solving high disk usage and slow startup issues on Windows 11.
Still confused or stuck about How to disable SysMain on Windows PC? Leave your questions in the comments or call me at +1– 844-405-0212. I am here to help!
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