A weird bug in Windows Defender could affect your Intel CPU's performance.
Developer Kevin Glynn, aka"Uncle Webb," has discovered a weird Windows Defender bug that causes Intel CPUs to suffer a significant performance hit on Windows 10 or 11., the bug causes Windows Defender to"randomly start using all seven hardware performance counters provided by Intel Core processors.
Uncle Webb saw his Intel Core i9 10850K take a 6% performance dip in Cinebench; he claims this can affect users with Intel Core CPUs from 2008 and on. Other instances saw Defender dinging CPU performance by around 4%. He did not see any issues on AMD Ryzen CPUs. The wild thing is that there is no way to predict when Windows Defender will act up. Uncle Webb says it could happen on boot or any time after, and unless you are actively monitoring your CPU performance, you won't know when it happens.
There's one rather questionable way of resolving this issue should you encounter it: disabling Windows Defender. Like Tech Power Up, we wouldn't recommend this approach, since it'll leave your system vulnerable.
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