![]() "We expect that on all these computers, MsMpEng.exe will consume around 75 percent less CPU than it did before when it is monitoring Firefox," he wrote.īut that's only half the battle because Microsoft's bug was aggravated by Firefox design decisions. The fix means that MsMpEng.exe will be less demanding of CPU resources for monitoring programs in real-time using Event Tracing for Windows – for any application. Redmond did not immediately respond to a request to explain why repairs took so long. Microsoft, which touts its own Chromium-based browser Edge to rival Firefox, patched the bug in its March 2023 Defender update, which was released on April 4 for the Defender engine and April 11 on the platform as a whole. "This performance issue makes calls to VirtualProtect (among other things) unreasonably expensive on Windows platforms when Windows Defender's Real-time Protection feature is active (the unreasonably expensive computations execute in the MsMpEng.exe process)." "We have reported the details to Microsoft, and they have acknowledged it. "There is a serious performance issue in the current version of MsMpEng.exe, which I was able to pinpoint using the WPR profiles from comment 78 and some debugging," he wrote. In March, Yannis Juglaret, senior software engineer at Mozilla, looked into the issue and identified what was going on. Serious surfer? How to browse like a pro on Firefox.Microsoft tells admins to autoreview your Autopatch alerts or autolose the service.Google Chrome fights the power drain (again). ![]() Microsoft Defender shoots down legit URLs as malicious.Years literally passed and Firefox on Windows continued frittering away CPU cycles when Defender was active - until last month. In August of that year, Firefox engineer Marco Castelluccio observed that Microsoft was aware of the issue and said he had contacted the Windows biz again as a reminder that Firefox users were still having problems. ![]()
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