What is perfmon.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the perfmon.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Perfmon.exe file information

Windows Task Manager with perfmon
Perfmon.exe process in Windows Task Manager

The process known as Resource and Performance Monitor or Reliability and Performance Monitor belongs to software Microsoft Windows Operating System by Microsoft (

Description: The original perfmon.exe is an important part of Windows and rarely causes problems. Perfmon.exe is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 157,184 bytes (64% of all occurrences), 163,840 bytes and 4 more variants. 
It is a Windows system file. The program has a visible window. Perfmon.exe is a trustworthy file from Microsoft. Therefore the technical security rating is 0% dangerous, however you should also read the user reviews.

Recommended: Identify perfmon.exe related errors

If perfmon.exe is located in a subfolder of "C:\Program Files", the security rating is 13% dangerous. The file size is 561,152 bytes (50% of all occurrences) or 671,744 bytes. The program has a visible window. It is not a Windows system file. Perfmon.exe is able to record keyboard and mouse inputs.

Uninstalling this variant: In case of problems with perfmon.exe, you may also uninstall the program using the Control Panel ⇒ Uninstall a ProgramPerformance Monitor 3.x.

Important: Some malware disguises itself as perfmon.exe, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the perfmon.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

It's the performance monitor!
is a Microsoft utility which includes counters for monitoring different aspects of system performance.
perfmon.exe is located in the folder C:\Windows\System32. Known file sizes on Windows 7/XP are 120,320 bytes (72% of all occurrence), 157,184 bytes. It is a Windows system file. The program has a visible window. perfmon.exe is a trustworthy file from Microsoft. Therefore the technical security rating is 0% dangerous,.
It's the performance monitor, but why it needs acess to the internet I can't tell.
It is the most resource hungry process running on my netbook.
Yes, it is a file name for the performance monitor. It should not run all the time if the performance monitor is not running. I checked this out on my laptop and desktop. The laptop that is running very slow has this process running without the performance monitor open. This tells me I need to look at where this file is located. If it is not located in the right place I think it should be removed.
Windows program trust full but in some computers jack up cpu usage to 100%  
why do you need a performance monitor as the system runs at the it own level anyway the perfmon.exe in that was is useless and is out dated my idea MS is to get rid of the junk stay with the better plan simple fast and fluid
Perfmon is a from-Windows 'service'
my perfmon.exe is in Windows\WinSxs\ is showing up in Windows 64, this was in 32. I am running Windows 10.My computer is running really slow and it states perfmon.exe was high in running. I can't find the one shown above at start of topic.
  E. Skinner  

Rating chart

Summary: Average user rating of perfmon.exe: based on 14 votes with 10 user comments. 5 users think perfmon.exe is essential for Windows or an installed application. 5 users think it's probably harmless. 2 users think it's neither essential nor dangerous. 2 users suspect danger. 4 users don't grade perfmon.exe ("not sure about it").

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Best practices for resolving perfmon issues

A clean and tidy computer is the key requirement for avoiding problems with perfmon. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the perfmon.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

perfmon.exe [all]