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Microsoft Zaps 5-Yr-Previous Defender Bug, Reduces CPU Utilization by 75% in Firefox

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A performance-sapping battle between Mozilla Firefox and Microsoft Defender was first mentioned on Bugzilla half a decade in the past. Nevertheless, Firefox customers can now rejoice, as Mozilla devs and Microsoft labored collectively to launch an replace to MsMpEng.exe (a core technique of Home windows Defender), which is at the moment being rolled out. Troubled customers ought to discover a important enchancment (opens in new tab) after the replace, with “a ~75% enchancment in CPU utilization from MsMpEng.exe when shopping with Firefox,” in response to senior Mozilla software program engineer Yannis Juglaret.

So, what has been taking place, and why was there an terrible interplay between Firefox and Microsoft Defender? Microsoft acknowledged an issue with MsMpEng.exe utilizing an excessive amount of CPU time when Home windows Defender’s real-time Safety function is spurred into motion. This alteration has helped lower the CPU utilization noticed by Firefox customers considerably.

Earlier than and after Microsoft’s patch (Picture credit score: Mozilla)

The Firefox app was notably arduous hit by the Microsoft bug, because the browser is alleged to generate as much as 7x extra Occasion Tracing for Home windows (ETW) occasions in comparison with rivals (Edge, Chrome and many others). It sends these ‘VirtualProtect’ calls to the antivirus / anti-malware supplier to attempt to maintain the browser secure from hurt because it roams the net.

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