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How to Fix Service Host Superfetch High Disk Usage

Brithny updated on Dec 11, 2020 Partition Manager | How-to Articles

What is Superfetch? Can I disable the Superfetch service host? And how to disable it? Check the overview first and then see the details.

Workable Solutions Step-by-step Troubleshooting
What is Superfetch? Superfetch is part of Windows Vista and onwards. This technology allows Windows OS to manage...Full steps
Fix 1. Disable Superfetch Use three ways to disable Superfetch: Command Prompt, Registry Editor, and Services...Full steps
Fix 2. Fix with Troubleshooting Go to Control Panel, choose View by Category, click System and Security. Click Security and...Full steps
Use a free partition manager You can enhance your PC and system performance and using a free partition manager...Full steps

Have you ever meet this situation: "Your PC runs into a problem that it couldn't handle, and the disk usage is nearly 100 percent, which is caused by Service Host: Local System."

service host high disk usage

This article tells you how to deal with this bad situation. Before we start to fix the high disk usage problem, we must know what the Service Host is and Service Host Superfetch to get a better understanding of your problem.

What Is the Service Host and Service Host Superfetch

Service Host

Svchost.exe is a generic host process name for services that run from dynamic-link libraries. Microsoft started changing much of the Windows functionality from relying on internal Windows services (which ran from EXE files) to using DLL files instead. From a programming perspective, this makes the code more reusable and arguably easier to keep up to date. The problem is that you can't launch a DLL file directly from Windows the same way you can an executable file. Instead, a shell that is loaded from an executable file is used to host these DLL services. And so the Service Host process (svchost.exe) was born.

Windows requires a lot of services. If every single service ran under one Service Host process, a failure in one service could potentially bring down all of Windows. Instead, they are separated out. Services are organized into logical groups that are all somewhat related, and then a single Service Host instance is created to host each group. 

Service Host Superfetch

Superfetch is part of Windows Vista and onwards. This technology allows Windows OS to manage random memory so that your apps can perform efficiently.

It helps third-party apps and critical Windows components to execute common tasks quickly. To achieve this, Superfetch stores and reads data for regularly used apps directly from RAM instead of resorting to the hard drive.

Superfetch is like drive caching. It copies all your commonly used files to RAM. This allows programs to boot faster. However, if your system doesn't have the latest hardware, Service Host Superfetch can easily cause high disk usage. High disk usage due to this service isn't always a problem. It's how this service works to optimize your system performance.

If you're using Windows 10 and you find that Service Host: Local System is taking much of your CPU, Disk or Memory usage, you're not alone. Many Windows users are reporting this problem as well. But no worries, it's possible to fix it. Read the tried and true solutions below to fix your high disk usage right now.

1. Fix Service Hosts Superfetch High Disk Usage via Disabling

SuperFetch decreases the boot time and make must-load programs more efficiently. However, it has been identified as a potential cause of disk performance issues in Windows 8 and later versions of Windows, including Windows 10. Here's how to stop this service. 

Method 1. Disable Superfetch in Windows Services 

Step 1. Press Windows + R or alternatively, type Run in the Windows 10 search box. Type services.msc into the "Open" box and click the "OK" button.

Step 2. Now find "Superfetch". Right-click it > select "Properties" > click "Stop" on the pop-up windows > click "Disabled" from the 'startup type' drop-down menu. 

fix service host superfetch high disk usage - disable superfetc in service

Method 2. Disable Superfetch with Command Prompt

Step 1. Click on Start and search for Command Prompt, right-click on it and click "Run as administrator" then click "Yes" to continue.

open command prompt
Step 2. Type net.exe stop Superfetch and press Enter. 

fix service host superfetch high disk usage - disable superfetc

Step 3. If the command above isn't valid, try net.exe stop sysmain instead.

Wait for a few minutes and see if your computer starts performing better. Or check your computer's disk usage in Task Manager. In the Processes tab, look at the % at the top of the Disk column. If it's no longer 100%, you've fixed the problem!

Method 3. Disable Superfetch Using Windows Registry

You can also disable the service host from Windows Registry. Follow the steps below to disable service host Superfetch.

Step 1. Press the Windows + R or alternatively, type "Run" in the search box. Type Regedit into the Open box and hit enter.

Step 2. On the Registry Editor window, navigate to HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/Session Manager/MemoryManagement/PrefetchParameters.

Step 3. Click the "Enabled Superfetch" and change its value to 0 to disable SuperFetch. Then click the "OK" button. 

fix service host superfetch high disk usage - disable superfetc in registry

Close the Registry Editor and restart the system to see if the service host Superfetch 100% disk usage in Windows 10 is fixed. 

2. Fix Service Host Superfetch High Disk Usage With Troubleshooting

Windows Update is said to be one of the causes of abnormally high CPU or Disk usage. You can run the troubleshooter to see if it's the culprit: 

Step 1. On your keyboard, press the Windows logo key and click "Control Panel".

Step 2. View by "Category", click "System and Security".

click System and Security

Step 3. Click "Security and Maintenance" > "Troubleshooting".

click Troubleshooting

Step 4. Click "Fix problems with Windows Update". Click Next.

fix problems with windows update

Step 5. Click "Try troubleshooting as an administrator". 

try as administrator

Wrap Up

We hope this tutorial has provided you with enough information about service host Superfetch high disk usage and how to disable it. You can now optimize your computer's performance and bring your disk usage back to normal by using either the Services, Command Prompt, Registry Editor, or Windows Troubleshooting method. You can try any or all of them to solve the problem.

Bonus Tip. How to Optimize Your PC with a Free Partition Manager

In addition to disabling Superfetch service to improve the performance of your computer, you can also manage your disk to improve the performance of your system. EaseUS free partition manager tool offers you co/comprehensive solutions to organize and manage your partitions in Windows 10/8/7 without effort.

  • Resize/move partition, create/format/delete/clone/merge partition
  • Convert FTA to NTFS, convert MBR to GPT, logical partition to primary or primary partition to logical
  • Wipe out all the data on hard disk permanently with one click
  • Supports 4K alignment on SSDs to maximize PC performance
  • Check for errors on selected partitions and fix it

Now, download and try this free partition tool to help you manage your disk and partitions without data loss. 


Step 1: Install and launch EaseUS Partition Master

Run EaseUS Partition Master

Step 2: Partition Hard Drive

Shrink partition:

1. Right-click on a partition that you want to shrink and select "Resize/Move".

Shrink partition

2. Drag the end of the partition rightward or leftward or adjust the space by clicking the "Partition size" column. Click "OK" to continue.

Extend partition:

1. To extend partition, you need to leave unallocated space next to the target partition. If not, shrink a partition as mentioned above to leave enough unallocated space behind the target partition first.

2. Then right-click on the target partition and select "Resize/Move".

Extend partition

3. Drag the target partition handle into the unallocated space to extend partition. Click "OK" to continue.

Create partition:

1. On the main window, right-click on the unallocated space on your hard drive or external storage device and select "Create".

Create partition on unallocated space

2. Set the partition size, partition label, drive letter, file system, etc. for the new partition and click "OK" to continue.

Delete partition:

1. On the main window, right-click on the hard drive partition which you want to delete and select "Delete".

Select parittion to delete

2. Click "OK" to confirm.

Change partition drive letter:

1. Right-click the partition, and choose "Change Drive Letter".

Change Drive Letter - Step 1

2. Click the down arrow, choose a drive letter for the partition, then click "OK".

Step 3: Execute operations

Click the "Execute Operation" button at the top corner and keep all changes by clicking "Apply".

When you finish all the steps, reboot your Windows 10. Go to Task Manager to see if Service Host: Local System high disk usage is solved or not. If all the solutions above all fail to help you, you can contact us and ask for help. We are very glad to help you.

People also ask

1. Is it safe to disable service host Superfetch?

Service host Superfetch is merely a memory management process. When you notice that it's always causing high disk usage, you can disable it; and it won't cause system instability. However, you may experience some delays when accessing frequently used applications, as they load faster when they service host Superfetch enabled. 

2. How do I disable the Superfetch service host?

As demonstrated in solution 1, there are three ways to disable Superfetch service host, either through Services, Command Prompt, or Registry Editor in Windows 10. Jump to the corresponding parts to see details.

3. Can I disable Superfetch service Windows 10?

Yes, when you find there happens service host local system high disk usage, you can try to disable Superfetch service in Windows 10 to speed up your computer.

4. What is Superfetch, and do I need it?

Superfetch is like drive caching. It copies all your commonly used files to RAM. This allows programs to boot faster. However, if your system has the latest hardware, the Superfetch works properly. If not, Service Host Superfetch can easily cause high disk usage. 

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