I wonder if you need to whitelist BIAB in Windows defender? I don't think it can hurt to try it and then remove the exclusion if you don't see improvement.

How can I approve an app in Windows Defender?
Stop Windows Defender from scanning certain files
Open the Windows Defender Security Center.
Click Virus & threat protection.
Click the Viruses and Threats option.
Under Exclusions, click Add or remove exclusions.
Click the Add Exclusion button.

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Retired to Make Music - No Plan B
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