Microsoft fixes a Windows Defender bug, first reported in 2018, that caused CPU usage spikes in some apps, especially Firefox, in Windows 10 and Windows 11 (Mark Tyson/Tom's Hardware)

Mark Tyson / Tom's Hardware:
Microsoft fixes a Windows Defender bug, first reported in 2018, that caused CPU usage spikes in some apps, especially Firefox, in Windows 10 and Windows 11  —  Post-fix you may see MsMpEng.exe CPU usage drop by up to 75%.  —  A performance-sapping conflict between Mozilla Firefox …

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