Microsoft Defender Antivirus gets ‘performance mode’ for Dev Drives

Microsoft has introduced a new Microsoft Defender capability named “Performance mode” for developers on Windows 11, tuned to reduce the impact of antivirus scans when analyzing files stored on Dev Drives.

As Microsoft’s Chief Product Officer for Windows and Devices Panos Panay stated, the Dev Drive and Defender performance mode combination can lead to a build speed boost of up to 30%. “Dev Drive is based on the Resilient File System, which, combined with a new performance mode capability in Microsoft Defender for Antivirus, offers up to 30% file system improvement in build times for file I/O scenarios,” Panay said.

Performance mode will be enabled by default for ‘Trusted’ drives, which is true for all newly created Dev Drives, and will only be available if real-time protection is toggled on.

It’s also ONLY available for Dev Drives and cannot be enabled on volumes using other file systems, such as FAT32 or NTFS. “A Dev Drive is automatically designated as trusted, providing the best possible performance by default. A trusted Dev Drive means that the developer using the volume has high confidence in the security of the content stored there,” Microsoft explains.

Any Dev Drives transferred from another device will be set as untrusted and use Microsoft Defender’s real-time protection mode instead, and not the new performance mode.

Performance drive also requires Microsoft Defender Antivirus, Microsoft Defender for Business, or Microsoft Defender for Endpoint Plan 1 or Plan 2 with Antimalware platform version of 4.18.2303.8 and Antimalware signature version of 1.385.1455.0.

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