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I've been using MSE for a couple months now, never had a single problem. All of a sudden the process "MsMpEng.exe" will randomly go crazy and hog all my system resources so I can't do anything unless I kill it in the task manager. (I've quit the program for now and my comp is running smooth). When I restart the program, reboot, whatever, it goes off and hogs all the resources again after a couple minutes. If I kill the process it will go away and then come back a couple minutes later and do the same thing. I've scanned with MSE, another antivirus and malware with no probs. Any ideas? Should I uninstall and find something else? The thing is I've liked it so far. I'm running Win7 64-bit.

Also, I'm not running any other conflicting security programs. This is the only one on my PC right now. Windows Defender is also off.

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  • What resources are you talking about? CPU/Memory/IO/...? Commented Feb 12, 2011 at 23:34

2 Answers 2

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You can adjust the amount of resources MSE uses. The following settings can decrease the resources usage without greatly effecting the effectiveness of MSE.

  • look at the settings tab>"scheduled scan" settings in MSE you should see the option to limit the cpu usage from 10-100%.
  • look at the "real time protection" settings and see what effect unchecking "enable network inspection system" and "enable behavior monitoring"
  • look in the "advanced" settings and see if "scan archive files" or "scan removable drives" are enabled.
  • verify your install is fully updated
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    +1 Didn't know that MSE allows you to limit CPU usage, nice! Commented Feb 12, 2011 at 23:33
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    Pretty sure the culprit was the behavior monitoring option. As soon as I disabled it and saved settings, CPU usage dropped considerably. Commented Jul 14, 2011 at 14:43
  • now, you need to do this through the group policy editor, which must be enabled first. you run gpedit then edit System Configuration\Administrative Templates\Windows Components\Windows Defender Antivirus\Scan\Specify the maximum percentage of CPU utilization during a scan, down to 5%. see itechtics.com/msmpeng-100-usage-cpu-disk Commented Nov 14, 2017 at 22:43
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Not the ideal solution, but you can attempt to set the process affinity to a single processor core so it can't take all the resources. This should leave your other processor core to do the other tasks you need.

This only works if you have a Multi-Core CPU obviously. :)

http://www.addictivetips.com/windows-tips/how-to-set-processor-affinity-to-an-application-in-windows/

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  • This hogs a complete core, and will bother programs that use multiple cores. It might be more than just CPU. Commented Feb 12, 2011 at 23:34

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