Service Host SysMain generates problems for PCs. How to disable it?

service host sysmain

Going by the name SuperFetch, Service Host Sysmain is an authorized digital service by Microsoft which allows PCs to maintain their performance through in-built optimization processes. In simple terms, Service Host SysMain is a folder auto-titled as System32 Folder, which improvises your computer system in multiple ways over time. 

To begin with, In early 2020, Microsoft observed through its metadata that over 60% of Windows PC users had disabled SuperTech due to its down comings. For example, it causes computers to run slow and overheat in a short period of time. However, according to Microsoft Experts, SuperFetech is a crucial part of Windows PC. In the absence of SuperTech, your PC will no longer be able to preload Apps and programs, causing a delay in the overall process. 

Source: Life Wire

Therefore, in October 2020, Microsoft switched SuperTech to SysMain and auto-enabled it in all Windows PCs at the global level. Thus, irrespective of whether you enabled or disabled the SuperFetch program before on your systems. SysMain is currently work-in-progress. It could be one of the mainstream reasons for your Disk Space to shrink. 

Today, we present this reading which will tell you everything you need to know about Service Host SysMain. So, let’s get started: 

Introduction to Service Host SysMain in Windows PCs

For the most part, service host SysMain is nothing new. It is just an identical version of previous Microsoft technology called SuperFetch aforementioned. However, many users will wonder why you need this service host in the first place? Following is your answer:

To begin with, for any reason, if your computer is running slow, SysMain automatically fixes it. According to our research, Service Host SysMain keeps collecting statistics related to computer performance such as RAM usage per program, frequently used Applications, and Programs, and launching Apps as quickly as possible. 

More often than not, users confuse SysMain for a high-end program that might use up all the RAM. However, in reality, SysMain uses very little Random Access Memory. Above all, if and when SysMain starts to use up RAM beyond the limit, it is crucial to disable it. 

But, with Microsoft’s new and automated version of SuperFetch, can you disable it? Let’s find out: 

How to disable Service Host SysMain on Windows PC? 

In the event that you want to disable the service host SysMain on your PC, please reconsider the condition that Apps on your PC will no longer preload. Meaning, you will have to launch them manually every time. Alongside this, your Hard Drive will no longer be priorities according to your customized patterns of use. Therefore, you will no longer view frequently used apps in the Start Menu. 

Source: TechSupportAll

Apart from this, after disabling Service Host SysMain, all customized settings will automatically change to default. The reason for such a reaction to the prior action is unknown. However, many users have encountered it. 

Method 1: Disable SysMain from Run Administrator 

Here’s a brief guide on how to disable service host SysMain:

  • To begin the process, go to keyboard navigation.
  • Now, press Windows Key plus R Key. 
  • “Run Window” will appear on your screen.
  • In the box, type “services.MSC.”
  • It is a command for service host management. 
  • As you can see, all apps and services running on your PC will appear in the list. 
  • Scroll down to the “SysMain” option and select it. 
  • Now, right-click on it. 
  • Further, select the “properties” alternative. 
  • In the general tab, change the StartUp type to “Disabled.”
  • Click on the “STOP” option at the bottom. 
  • Then, Click on the “OK” Button and Apply. 

Note: Even if you disable Service Host SysMain Auto-program, there is a chance that it will automatically reactivate whenever you shut down your PC. Or, in case there is a new software update available, SysMain will prioritize the hard drive and reactivate itself. 

Method 2: Disable SysMain by accessing Registry Editor’s Choice

According to the forums that Microsoft received, many users delivered information that SuperFetch is actually acting against its main purpose. For example, it is supposed to improve computer’s performance. However, out of the blue, it is causing issues like CPU overheat and memory usage over the top. Thus, while disabling SysMain using the first method, it is possible that your system is unable to run it. 

Henceforth, to play on the safe ground, here’s another method for your reference: 

  • To open the Registry Editor, Open the Start Menu. 
  • At the bottom, type “Regedit.”
  • Under programs, select Registry Editor. 
  • Right-click and open it. 
  • First, Go to HKey_Local_Machine. 
  • Now, Go to “System” and then select the CurrentControlSet option. 
  • Again, click on the “Control” option and then select the Session Manager alternative. 
  • In the expanded reel, select the Memory Management option.
  • Then, click on the “PreFetchParameters” option.
  • On the right side (main results), do you see Enable SuperFetch File? 
  • Select it and click on the “Modify” option ahead. 
  • Edit DWORD 32-Bit Value box will appear on the screen. 
  • Here, change Value Data to 0 (zero) and base it to “Hexadecimal.”
  • Click on the OK button.
  • The Service Host SysMain will be disabled. 

To confirm the editor’s setting, please restart your PC. 

Method 3: Disable SysMain via Command Prompt

Presuming that you are unable to disable Service Host SysMain using the above methods, it means that this hosting service is causing your computer some severely serious issues. It is possible that you are unable to enter computer settings or registry editor in the first place. In this scenario, the last option is the command prompt which will quickly fix the issue. 

service host sysmain
Source: Wikipedia

Check out the brief instructions below to disable SysMain via Command Prompt: 

  • Click on the “Start Menu” option. 
  • Type “cmd” command in the search [box] and Enter.
  • Under programs, click on the “command prompt” option. 
  • Then, enter the following command “sc stop “SysMain” & sc config “SysMain” start=disabled.”

Note: If you are using the older version of Windows, it is quite possible that SysMain is not in-built on your PC. In this situation, the above command will fail. Thus, instead of using “sysMain” in the above command, replace it with “SuperFetch.” 

What are the major signs of problematic SysMain? 

A computer can perform slowly due to many issues. For example, if you have updated your Windows Driver for over ten months, there is a greater chance that it will slow down because of several bugs in the previous version. However, how do we know if the main problem is caused by SysMain? If it is the main culprit or not! Following are some notable signs that prove your SysMain is acting up: 

Service Host SysMain problematic? You will see Status “100% Disk Utilization” appears on the screen

From our practical research on SysMain, it is pretty much clear that this program doesn’t utilize more than 1-2% of the disk. However, if it is happening to your system consistently, it is possible that SysMain is causing it. Often, Disk Utilization doesn’t go up more than 10%. Even if it shows 100% utilization, it is only for a few seconds. 

In order to fix this issue without disabling Service Host SysMain, check out some simple solutions: 

service host sysmain
Source: LifeWire
  • Scan your PC for viruses or malware.
  • Restart your computer using the command prompt.
  • Turn off applications running in the background.
  • Enable or Disable SysMain Host Service. 
  • Close all tabs on your browser and refresh. 

PC Shutdown after a gap of few minutes

Is your laptop heating up even though you are not using any heavy applications? It is possible that SysMain is putting pressure on the CPU, and it shuts down. Often, this condition is also vice-versa. For example, if you haven’t cleaned your CPU’s fan for a while, it may begin to act up. In order to keep your computer running, SysMain will push to increase its performance. As a result, it shuts down completely. 

  • Deactivate Sleep Mode on PC. 
  • Uninstall and then Reinstall Windows Driver.
  • Avoid using unethical ways to shut down PCs. 
  • Clean your CPU regularly. 
  • Avoid smoking around the computer or laptop. 
  • Disable Service Host SysMain for CPU to perform independently. 

Service Host SysMain causes Slow Boot Up

We are in the 21st century already, and when our computer systems or laptops do not boot up within 10 seconds after hitting the power button, we instantly know something is wrong with it. In many cases, SysMain causes the computer to boot up late. The reason being, SysMain starts prioritizing hard drives according to the apps that you used previously or frequently. As a result, it takes time to boot up. 

Source: How To Geek

In order to quit this constant loop, disable service host SysMain. Some other solutions to resolve this issue are: 

  • Turn off Fast StartUp in advanced settings.
  • Deactivate Windows Subsystem for Linux. 
  • Update Graphics driver to the latest version. 
  • Uninstall unwanted startup programs which are outdated already.

What to do if you cannot find the SysMain.Dll file on your system?

To begin with, each computer system has a Dynamic Link Library file. For sysMain, this file remains in the System32 Folder. In many cases, when users disable the Service Host SysMain program, they keep encountering the error “Windows cannot load the extensible counter DLL.” If you do not fix this error, there is a chance that you will experience the blue screen of Death sooner than you think. 

In order to resolve this issue, it is crucial that you enable SysMain as it will help the PC to locate the DLL File. Apart from this, you can try and scan your computer for viruses or malware that may have impacted the DLL or tampered with in some way. 

If you have no notion of what DLL is, you can check the recycle bin to see if you have deleted it mistakenly. Above all, scan the computer using the command prompt. Enter the command: 

DISM.exe /Online /Cleanup-image /Scanhealth – [Press ENTER]

Then, DISM.exe /Online /Cleanup-image /Restorehealth – [Press ENTER]

DISM.exe /online /cleanup-image /startcomponentcleanup – [Press ENTER]

In a strict manner. 


Now that you havee percieved everything you need to know about SysMain Service Host, you can handle your PC with care. Again, SysMain is a program that helps your PC to run smoothly. Thus, if you are disabling it anyway, we recommend you replace it with a VPN service as an alternative. For more information, ping us!

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