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I wonder how big a role Windows Defender, or other antivirus software, plays in the notorious inefficiency of reading and (especially) writing many small files on Windows. Sam, did you disable Windows Defender real-time protection, or add exceptions for it?

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Absolutely disabled defender.

When I started running the spec suite in WSL, defender went way up (so I gave it a break), pretty sure stuff would have been way worse with defender on.

The prevailing recommendation though from the WSL team is to leave defender on for now. So I kind of cheated by disabling it.

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