• Windows Defender can Significantly Impact Intel CPU Performance

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    #2457078

    Windows Defender can Significantly Impact Intel CPU Performance, We have the Fix

    Kevin Glynn, aka “Uncle Webb,” our associate software author behind popular utilities such as ThrottleStop and RealTemp, developed a new utility named Counter Control, which lets you monitor and log the performance counters of Intel Core processors since 2008 (Core “Nehalem”). During development for ThrottleStop, Kevin discovered a fascinating bug with Windows Defender, the built-in security software of Windows, which causes significantly higher performance impact on the processor than it should normally have. Of course a security software is bound to have some (small) performance impact during real-time protection, but this is much bigger…

    The first sign that something is happening is that HWiNFO will be reporting a reduced “Effective Clock” speed when the CPU is fully loaded. A much bigger problem is that when Defender is affected by the bug, performance of your machine will be significantly reduced. For example, a Core i9-10850K running at 5.00 GHz all-core loses 1000 Cinebench points (or 6%). Such a performance loss has been reported by owners of Intel Core 8th, 9th, 10th and 11th Gen, both desktop and mobile CPUs, on both Windows 10 and Windows 11. AMD processors are not affected

    There are two ways to go about mitigating this performance loss permanently. You could disable Windows Defender Real-time Monitoring, which is highly not recommended due to the security implications; or you could use the latest version 9.5 of ThrottleStop, which has a feature in the “Options” window, called “Windows Defender Boost.” ..

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    • #2457250

      Wow. Ran that test on my 11700K, and yup, 6% difference in Cinebench scores.

      13,984 -> 14,893

      Linux Mint 20.3 (Cinnamon) | Windows 10 Home 21H1
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    • #2457853

      My i5-8500 Windows 11 system was affected by this. I didn’t bother to do benchmarks, but certain tasks that used to take a bit longer than I thought they should are now much faster.

      Unrelated, but I also found that Microsoft Edge had put itself into the startup menu with property ‘enabled’, so I disabled that. I’m sure it wasn’t always there and enabled.

      • #2457855

        Unrelated, bu I also found that Microsoft Edge had put itself into the startup menu with property ‘enabled’, so I disabled that. I’m sure it wasn’t always there and enabled.

        Depends on Edge, Settings, System & performance, Startup boost; but it gets enabled automatically on most computers:

        Get help with startup boost

        Windows 11 Pro version 22H2 build 22621.317 (group ASAP) + Microsoft 365

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