Mitigations that patch the new Downfall vulnerability in Intel's previous Best CPUs have finally been released. Now, Microsoft has provided a method for turning off the Downfall mitigation for users that require speed over security.
To disable the Downfall mitigation, open an elevated Administrator command prompt and type the following:
REG ADD "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" /v FeatureSettingsOverride /t REG_DWORD /d 33554432 /f.
Alternatively, you can execute the same command in the Windows Registry by heading to this location
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management, finding the value name FeatureSettingsOverride, finding the value type REG_DWORD, and inputting the hexadecimal code 0x2000000.
According to latest information from Windows teams from Microsoft.
The Downfall mitigation on new recently Insider Build had been protecting by new OS kernel design feature already.
Thus there are no different in performance all solution above or do nothing with new OS build.
CPUFLAG 33554435 on memory session performance
CPUFLAG 33554432 from Microsoft advise solution
CPUFLAG 0 from Windows OS Kernel Default
Update from Windows teams 12 June 2025 . If there are new vulnerable issue Windows team will testing and considering the key factor that impact system performace before bring us solution that need to do. Threat that performance hit below 10% overall Windows team will handle it and coming with solution fixing aka Windows Update (KBXXXXXXX) for end users. Threat that performance hit above 10% but below 30% overall Windows team will sending data to vendors ( Intel , AMD , Qualcomm , Mediatek , Apple , Chinese X86 clone CPU etc. ) the vendors will handle it and coming with solution fixing aka Microcode or Firmware Update ( ME or AGESA or ARM64 Firmware patched etc. ) Finally if there are above 30% penalty hit overall Windows teams and vendors teams will negotiating then joint to solving that threat for us all. There are new OS kernel update and Microcode or Firmware Update coming together.
Regards
