It took over five years, but Microsoft has finally fixed a bug that caused Windows Defender to drain CPU resources when Mozilla’s Firefox browser is active. In 2018, Mozilla staff reported that ...

When using Windows Performance Recorder (WPR), which checks system and application behavior and resource usage, if the CPU usage rate of 'MsMpEng.exe', which is the Microsoft Defender execution ...

There are two common factors that can cause Antimalware Service Executable to take up too much CPU resources, from its real time feature and Full scan feature. Real time protection Feature is ...

I just noticed on my mom's computer that some "MsMpEng.exe" process (labeled "Antimalware Service Executable" and located under "C Program Files\Microsoft Security Client\") is consuming 100% of CPU.