Solve the problem of excessive CPU usage of McAfee Scanner service

Is there a problem with the mcshield.exe process occupies too much CPU on your computer? This article will introduce the mcshield.exe process in detail and how to solve the problem of the McAfee scanner causing the high CPU usage of Windows 10/11.

What is mcshield.exe ?

mcshield.exe is an important part of McAfee antivirus software, responsible for protecting computers from malware and removing existing malware infections. This process is also known as the McAfee scanner service, McAfee real-time scan service, real-time scan service, or NT real-time scan service.

If the mcshield.exe process occupies a large amount of CPU resources, even reaching 100%, it will affect the operation of other processes, causing the system to be stuck or even unusable. Systems with Windows Vista and later require at least 1GHz CPU and 2GB of memory to run McAfee. This problem may still occur even if your computer configuration meets the requirements. Here are some solutions:

How to fix the problem of excessive CPU usage mcshield.exe

1. Update Windows/McAfee

If you are using a multi-threaded version of McAfee, the mcshield.exe process may occupy a large amount of system memory due to insufficient available memory, causing CPU usage to soar. Updating McAfee or Windows systems can resolve this issue. You can check for updates through the McAfee software itself, or download the latest version online and reinstall it.

To update Windows 10/11, go to Settings > Windows Update (for Windows 10, Access Updates and Security ). Then, check for available updates (including optional updates) and download and install them.

2. Disable anti-spam function

McAfee's anti-spam feature sometimes increases CPU usage for McAfee scanner/ mcshield.exe . Disabling this feature can free up a large amount of CPU resources. If you are using the latest version of McAfee, this feature may not be found because it has been removed. If this is the case, skip this step.

Step 1: Launch McAfee and go to Settings .

Step 2: Select Anti-Spam and click Close .

3. Update NVIDIA graphics card driver

McAfee has discovered that there are problems with the NVIDIA graphics card driver, which may cause mcshield.exe program thread to continuously occupy CPU resources. This is mainly because of the graphics card drivers rather than McAfee itself. Update the graphics card driver can resolve this issue.

Step 1: Visit this page in your browser – http://m.miracleart.cn/link/a3c1e64ad2997b7947556ba8806f6e56

Step 2: Select the product type , product series , product , operating system , download type and language , click Search to find the driver, and then click Download to get the installer.

Step 3: Double-click the .exe file to complete the installation.

4. Uninstall McAfee

If none of the above methods can solve the problem, please consider uninstalling McAfee from your computer. Press Win R to open the run window, enter appwiz.cpl , and then click OK to open the program and function . Find McAfee and uninstall it.

You can use the Windows 11/10 built-in Windows Security Center to protect your computer from malware.

in conclusion

The above is a common way to solve the problem of excessive CPU occupancy of McAfee scanner service or excessive CPU occupancy of mcshield.exe in Windows 10/11. If you encounter this problem, take action immediately.

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