Service Host SuperFetch/SysMain: Local System, Fix High 100% Disk CPU Usage [SOLVED]

What is Service Host Sysmain or, SuperFetch? Why Service Host local system consuming 100% disk usage? How to fix high 100% disk cpu usage?

Superfetch is part of Windows Vista and onwards. SuperFetch is an innovative memory manager that analyzes usage patterns over time to optimize memory content. This technology directly allows Windows OS to manage random memory, in this way your apps can perform efficiently and in a better way.


Service Host SuperFetch is a Windows process that improves hard drive performance, but sometimes causes slowdown with an SSD. The windows process improves the hard disk because it looks into the system and fetches frequently visited apps and programs so that it can store them. It also helps third-party apps and critical Windows components to execute common tasks quickly. Why Service HostSuperfetch is consuming a lot of Disk resources every time windows is starting up?

Service Host: SuperFetch Local System High CPU 100% Disk Usage

Service Host: SuperFetch Local System High CPU 100% Disk Usage

What is Service Host SysMain or SuperFetch Service: SysMain is a feature which was introduced back in Windows Vista, under a different name as SuperFetch. Over time, SysMain marks these applications as “frequently used” and preloads them into RAM. In this way, It is already loaded into memory so it will start much faster after starting the application.

Meanwhile, For all windows vista and onwards, SuperFetch is available. In short, This is part of windows that allows windows OS to manage RAM and allow all the apps run smoothly and efficiently. Third party apps are able to run quickly when the SuperFetch is available.

When using the system again, SuperFetch loads the elements of the applications and programs you run most often in to the RAM. In this way, the RAM allows them to load more quicker than they would without the service host SuperFetch. It is a way of improving the speed of browsing into the apps that one frequently uses.


The issue service host local system high disk may be caused by the old CPU. Your computer may fail to boot due to some incompatibility problems after upgrading the CPU. If so, you may need to reinstall Windows. Thus, you can back up your data before updating the CPU so as to keep your data safe.

Check Also: 7 Best iOS Emulator for PC (Windows & Mac) to run iOS Apps 2020

Even if your drive seems pretty comfortable acting as a chronic overachiever, keep in mind that 100disk usage is not something for you to take pride in. Your disk working at or near 100 percent causes your computer to slow down and become laggy and unresponsive. As a result, your PC cannot perform its tasks properly.

  • Superfetch or SysMain is a legitimate Windows 10 service.
  • Though this service is to speed up the app’s times it creates issues for some users like high CPU usage and high disk usage.
  • In Windows XP it was known as the prefetch service and in Windows Vista, it was renamed superfetch.

Meanwhile, Don’t disable SysMain (previously known as SuperFetch).

  • If you load a program, Windows has to copy the executable into memory in order to run it.
  • The program still exists in RAM, after closing the application even.
  • Windows won’t have to load anything from disk – it will all be sitting in RAM after you run the program again.


Service HostLocal System is a bundle of system processes, or you can call it a generic service hosting container. It includes processes including Windows Auto Update and many required system services would be running in it.

So, Service Host(svchost.exe) is a generic service hosting container, any number of required system services can be running in it. If you are running Windows 10 and you find that Service Host: Local System (Network Restricted) is taking much of your CPU, Disk, or Memory usage then you are at the right place.


If you consistently see a very high disk usage, it means there is something else going on that isn’t quite right. To start, you can check your disk usage by opening up the Task Manager in Windows 10. On the main Processes tab, you’ll see a quick overview of the CPU, Memory, Disk, and Network utilization.

  • Just like any other programmed process the SuperFetch can go wayward and bring more problems than it solves.
  • The fact that this process runs in the background and it stores some information means that it uses some CPU and Random Memory.
  • Sometimes the system might erase the information in the RAM and send information of the recently used files.
  • And, here you lead to slowdowns due to low storage or even optimized storage. Why because? space is filled by large details of the recent files that you have opened
  • This is a bit hard to detect because this process runs together with other services and the task managers might not detect the problem.
  • However, it might look difficult, sound, or heard. So, this article will give you quality advice that can be applied to solve the problem of your computer.

Read the following instructions to see the several steps you can take to solve the 100% high disk usage problem right now.


One might consider disabling the service after checking the RAM high usage of resources (In short, RAM has been eaten up). But, is that the right decision? Remem ber the service allows you to get to frequently used services speedily. Now, if you disable it, then it means you might lag a bit when visiting the apps that you commonly use.

Is svchost.exe a virus? No, it is not. The true svchost.exe file is a safe Microsoft Windows system process, called “Host Process”. However, writers of malware programs, such as viruses, worms, and Trojans deliberately give their processes the same file name to escape detection.

If you have a properly working system, it will not be wise to consider disabling the service. On the other side, if you have poor performance services, and the system uses HDD. This is the time when you can consider disabling the SuperFetch. However, if you resolve this method then the following steps would get you there;

  • Step 1 – Press the ‘Windows key’ and ‘r’ at once.
  • Step 2 – Type ‘service.msc’ and after that click enter.
  • Step 3 – Find superfecth on the list of the menu that comes on the screen.
  • Step 4 – Do the Right-click and make sure to select properties.
  • Step 5 – Here’s the stop option that lies within the options that pop up. Click it to stop the SuperFetch from running.
  • Step 6 – Then go to the startup type menu that is in properties and click it. A pop up comes with some options. Select disabled as your option and that’s it!


The second method of disabling the SuperFetch is by using Windows Registry. If you would like to use the windows registry route to disable the SuperFetch, then consider the following steps;

  1. Click the start button of the windows and click RUN to open the dialogue box.
  2. Type “Regedit” and then click the enter button on the keyboard.
  3. Then click the “HKEY_LOCAL_MACHINE” folder.
  4. Go to SYSTEM, then click the current control set.
  5. Then, click the Control Options and it will take you to more options.
  6. Select the session manager, Next option should be Memory Management.
  7. The last option to select here is Prefetch Parameters.
  8. Now, double click on ‘Enable SuperFetch’ on the right-hand side.
  9. The final option is to “Disable the SuperFetch” and you are good to finish.

Now, The below additional steps will help you in a better way to find the solutions of ‘How to Disable SuperFetch’. The below steps will redirect you to the same destination, in case the above option is not working for you!

  1. Click the prefetch parameters folder and make a right-click on it.
  2. Then choose open NEW.
  3. Then select the DWORD value.
  4. Enter 0 as the value. When you enter the zero as the value, you would have selected to disable this service now select ok.
  5. Close the registry editor after that.


The SuperFetch is designed to detect an SSD drive and switch off prefetch and superfetch by default in Windows 10/8/7. However, if you wish to turn off the services manually then you can consider making the steps below;

  1. Click start
  2. Type in services.msc
  3. Scroll down to get to the superfetch option
  4. Double click on it and disable options come right before you. You are done after clicking on it!

The other method that is used to disable service host SuperFetch is by using a third party or software like the EaseUS partition Master. You can download it and use it as follows.

  • Step 1: Download and install  EaseUS Partition Master. Select “Tools” and click “System Optimization”.
  • Step 2: Click “Junk File Cleanup”. Then click “Analyze”. EaseUS Partition Master finds junk files on your PC.
  • Step 3: You can check and choose junk files and click Clean up. All of the selected junk files will be cleaned and deleted from your PC. Click “Yes” to clean up junk files.

When you finish all the steps, reboot your Windows 10. Go to Task Manager to see if the disk usage of “Service Host: Local System” is normal.

Thank you for reading until the end.

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