What is Service Host Superfetch? Fix its high CPU!

Are you concerned about Superfetch service causing high disk usage on your PC? Do you want to disable the service but not sure what changes it will make? You will find answers to these questions below.


What does service host SuperFetch do?

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

It helps third-party apps and critical W indows 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.

Since fetching data from RAM is faster compared to reading it from the hard drive, Superfetch helps you to open commonly-used apps in a snap.

In a nutshell, it boosts your system speed by doing three tasks.

1- Decreases boot time

2- Loads common apps quickly

3- Learns your usage pattern


Superfetch disk usage problem – Why it reports high disk usage?

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 could easily cause high disk usage.

Although often alarming, Superfetch high disk usage is rarely a danger sign. It’s because this service makes your computer use its maximum ability to respond to I/O requests. It cleans up RAM and copies new files that you have been accessing recently.

Once this service has completed overhauling your RAM, it will automatically reduce disk usage.


Should I disable this service?

As explained above, high disk usage due to this service isn’t always a problem. It’s how this service works to optimize your system.

When you are using your PC for some time, this host service starts to fill up the RAM with frequently used files. As the size of these files increases over time, it could take longer to sort out memory.

That’s when it becomes a problem.

How to disable this service?

When you notice service host Superfetch always causing high disk usage, you may want to disable it. Disabling this service won’t cause system instability. However, you may feel some lag when accessing commonly-used apps that would load faster when it is enabled.

To disable this service host, you can follow any of the following methods. Both methods are safe to use as long as you follow the instructions carefully.


1- Disable it from Services

To disable this service, you can use the following steps.

1- Press Windows key + R to open Run dialogue box

2- Alternatively, you can click on Start in Windows and type ‘run’ to locate Run dialogue box

3- Type ‘services.msc’ and press Enter to bring up Services window

4- Once you have the list of Services, find Superfetch

service host superfetch

5- Right-click on this service and select Properties

6- Once the properties window pops up, click on Stop

7- From the ‘startup type’ drop-down menu in Properties, click Disabled

superfetch disabled

That’s it. Go back to the Task Manager and check disk usage. It should report normal usage now.


2- Use Windows Registry

You can also disable service host from Windows Registry. Follow the steps below to disable this memory management service.

1- Bring up Run dialogue box by pressing Windows key and R key together

2- You can also open Run dialogue box by using Windows search next to Start button

3- In the Run dialogue box, type “Regedit” without quotes and hit Enter on your keyboard

4- When the registry Window appears, go to HKEY_LOCAL_MACHINE folder

5- Under this folder, navigate to SYSTEM > CurrentControlSet > Control > Session Manager > MemoryManagement > PrefetchParameters


6- Double-click on ‘Enable Superfetch’ value on the right side

7- If you can’t find this value listed, simply perform the following additional steps

a. Right click on PrefetchPArameters folder
b. From options, open New > DWORD Value
c. Now enter ‘0’ as value to disable this service
d. Select OK

8- Now close the registry editor

Go ahead and check Task Manager now. You should not see this service anymore.

I hope this guide has provided you enough information about this host service and how to disable it. You can now easily bring your disk usage back to normal by using either the Registry editor method or Services method. The choice is yours!

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