Antimalware Service Executable or the process MsMpEng (MsMpEng.exe) used by windows defender program. Windows defender service is the service associated with this program. There are two reasons behind antimalware service executable high CPU. One of them is constant file scanning, and another is real-time application. The second reason is real-time application scanning that … [Read more...] about How To Fix High CPU Usage By Antimalware Service Executable (Msmpeng)?