Antimalware Service Executable -

: Installing new virus signatures often triggers temporary performance dips. How to Fix High Resource Usage

Moving scans to a time when you aren't using the PC can prevent slowdowns during work. antimalware service executable

, also known as MsMpEng.exe , is a background process essential to Microsoft Defender Antivirus . Its primary function is to provide real-time protection by scanning files, programs, and downloads for viruses, spyware, and other malicious software. Why It Uses High CPU and Memory : Installing new virus signatures often triggers temporary

: Scheduled background scans can spike CPU usage to 100%, especially on older hardware. also known as MsMpEng.exe

Preventing the service from scanning itself can significantly reduce CPU load. Open > Virus & threat protection .