Microsoft deigns to fix five-year-old Defender bug that slowed Firefox
"There is a serious performance issue in the current version of MsMpEng.exe, which I was able to pinpoint using the WPR [Windows Performance Recorder] profiles from
and some debugging," he wrote."We have reported the details to Microsoft, and they have acknowledged it."makes calls to VirtualProtect unreasonably expensive on Windows platforms when Windows Defender's Real-time Protection feature is active ." Microsoft, which touts its own Chromium-based browser Edge to rival Firefox, patched the bug in its March 2023 Defender update, which wasRedmond did not immediately respond to a request to explain why repairs took so long.
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. "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
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