However, just like any other executable, MsMpEng.exe might be malware-in-disguise, especially when computer users often face frequent PC crashes, BSOD's and suffer from similar issues.Īntimalware Service Executable/Microsoft Defender Nevertheless, some users complained that MsMpEng.exe causes high CPU and memory usage for prolonged periods of time, or when a particular Windows feature is used (e.g., Bluetooth) – there are several reasons and fixes for these issues. While it is normal to see the process to be running at all times, MsMpEng.exe will increase the CPU usage during intense scanning sessions of particular computer files or processes. MsMpEng.exe is responsible for real-time protection services, and its main purpose is to scan the incoming files and existing processes in real-time to prevent the intrusion of viruses, trojans, ransomware, rootkits, cryptominers, adware, worms, and other malware. The software comes pre-installed on all Windows operating systems and ranks very well between commercial security programs offered by various AV vendors. The file is a part of Antimalware Service Executable – a service that runs at all times during OS operation and belongs to Microsoft Defender (formerly known as Windows Defender). MsMpEng.exe is an executable that can be found on most Windows operating systems.  I also set to Limut CPU is an Antimalware Service Executable that belongs to Microsoft Defender anti-malware component  We mainly want to tell MSSE that we only want to scan if the computer is not in use.  I have since found that, in the newer version of Microsoft Security Essentials, there are some options that have also helped. That post says to exclude some directories from your scanning. I had an original post here which may solve your issue as well: (extra large amounts of memory and cpu time may even be 100%)  From time to time I notice some weird issues on my client computers, where MsMpEng.exe ( Antimalware service executable) is using way too many and high resources and cpu time. It just works, and does its job quite well. I generally do not have any issues with Microsoft Security Essentials. MsMpEng.exe – Antimalware service executable Februin Antivirus / Security / Windows 7 / Windows XP tagged Antivirus / Security / Windows 7 / Windows XP by Greg
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