Know How to Fix Service Host SysMain That Can Cause 100% Disk Usage?

Service Host SysMain

Many of the Windows 10 users had earlier faced issues related to Superfetch service that not just caused high disk usage but made the systems run slow. This service has now been replaced by a new service names Sysmain that provides users with the same service but with a new identification. It is noticed that Service Host SysMain too uses disk completely that it should not which makes our computers significantly slow.

What is Service Host Sysmain?

Besides RAM, Windows 10 has another paging file known as Virtual Memory. This is a memory space reserved on a computer hard disk that allows storing and loading of new data. When RAM does not have sufficient memory, the program might use Virtual Memory on the hard disk. Previously, the Page File memory was introduced by Windows Vista under the name Superfetch. This page has now been replaced by Sysmain after Windows 10 version 1809.

Sysmain is one of the Service Host Bundles that comes with various services like Local Service, Windows Update and Network Service among others. However, the system needs more space than expected and instead of sending data to the page file on a hard disk, it compresses the data. This means a 2 GB file can be compressed to 1GB. Putting succinctly, Sysmain evaluates your application usage and optimise program launching.

What is the use of Service Host Sysmain?

Windows 10 initiates Sysmain whenever the user requires a large amount of memory for running a particular application.  Although Windows does not use Sysmain unnecessarily, it is used during space crises. Moreover, Sysmain is comparatively better than Superfetch in regards to performance but has the same issues that Superfetch had i.e. disk usage. Under many conditions, Sysmain can even use your 100% disk space that degrades your PC’s overall performance.

But we must also have to say that Sysmain improves and maintains system performance as per Windows 10. It collects and stores every relevant data utilised by the system. The service thereafter reorganizes the data like blocks in the disk and prioritises them accordingly. In short, Sysmain will give you trouble only if you are using HDD on your PC. Since HDD are slower to reorganise, it is always suggested to use SSD that minimises disk usage. Ironically, Sysmain was meant to optimise our Pc performance but they have rather slowed them than ever before.

How to fix the Service Host Sysmain issue?

If your PC has too slowed down or if you are facing any of the above-mentioned issues, you must disable Sysmain completely. Fortunately, doing so will not impact your PCs performance and speed at all. We have listed four options below to disable Sysmain in your system. You can select either of the four ways to fix the issue and improve your pc performance.

Option 1. Disable SysMain using Windows Services Manager

1. Hold down Windows+R keys to open the Run dialogue box.

2. In the Run text box, type in Services.msc and click OK.

3. Scroll through the services list and locate SysMain.

4. Right-click SysMain and click Properties.

5. Once in SysMain Properties, click the Stop button under the Service status section.

6. Then, Under the Startup type setting, open the drop-down menu and select Disabled

7. Click Apply and click OK.

8. This will stop Sysmain launch during system start-up.

Option 2. Disable SysMain using Command Prompt

1. Hold down Windows+R keys to open Run.

2. Next you need to type CMD in the Run Text box after which hold down Shift+Ctrl+Enter keys. Open elevated Command Prompts.

3. In the Command Prompt window, type in sc stop “SysMain” & sc config “SysMain” start=disabled. Press Enter key and you may see the ChangeServiceConfig SUCCESS message.

4. to check if disk usage has been minimised, close the Command Prompt and open Task Manager.

Option 3. Disable SysMain using Registry Editor

1. Hold down Windows+R keys to open Run.

2. In the Run text box, type in Regedit and click OK.

3. Once in the Registry Editor, navigate to KEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SysMain

4. In the right pane, right-click Start and click Modify.

5. In the Value data text box, type in 4.

6. Click OK to save the changes.

Option 4. Run Windows Update

You can fix the issue related to Service Host Sysmain by updating your Windows 10 software. Microsoft does introduce new updates to solve bugs related issues, optimize system performance and improve system stability. This means, updating your system can save you from the Sysmain issue in the easiest way. To do so,

1. Right-click the Start Menu button and select Settings.

2. Then, select Update & Security.

3. Click the Check for updates button.

4. If Windows has already checked for updates, click the Install now button.

5. Wait for Windows to download and install the latest updates.

6. Then, click Restart now when prompted, and allow your PC to reboot.

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