Configure performance mode status
Supported on: At least Windows 11 Version 22H1
Registry
Software\Policies\Microsoft\Windows Defender\Real-Time Protection Value name: DisableAsyncScanOnOpen
Enabled: DisableAsyncScanOnOpen = 0
Disabled: DisableAsyncScanOnOpen = 1
Description
This policy controls Microsoft Defender Antivirus performance mode for Dev Drives. A Dev Drive is a disk drive optimized for higher performance in software development scenarios. When this policy is Enabled or not configured, Performance mode is turned on for Microsoft Defender Antivirus. In Performance mode, Microsoft Defender Antivirus security checks of content stored on Dev Drives are conducted asynchronously to enhance performance. Performance mode requires the following policies also be enabled: “Enable dev drive”, and “Dev drive filter attach policy”. If you either Enable or do not configure this policy setting, Performance mode is turned on. If you Disable this policy setting, Performance mode is turned off and Microsoft Defender Antivirus will protect a Dev Drive in the same way as other drives.