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I've been experiencing performance issues on my mid-2011 mac mini (running El Cap) for a while now -- beachballs, spotlight issues, general slowness -- and have been so far unable to discern the actual cause (this is, in part, why I haven't yet upgraded to Sierra). I just noticed that the root of my primary drive is marked as quarantined:

andy@Aurora[14:57:14]: $ ls -ldeO@ /
drwxr-xr-x@ 40 root  wheel  - 1428 Jan  7 16:20 /
    com.apple.quarantine      68

Is it possible that this is the cause of my problems? And how would I go about fixing it?

Andy S.
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Before doing anything else I would strongly recommend you backing up all your files and (after that) double checking for malware on your Mac.

You can remove the com.apple.quarantine attribute with xattr -dr com.apple.quarantine /. For a more in-depth explaination of the com.apple.quarantine extended attribute, see this answer.

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