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Date: Wed, 07 Sep 2016 11:38:57 +0200
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: Ben RUBSON <ben.rubson@gmail.com>,
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Subject: Re: [ZFS] refquota is very slow !
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Ben RUBSON wrote on 09/07/2016 10:44:
>
> OK !
> Well, Juergen you put me on the right way.
> I investigated further and further and found that refquota slowness is not due to the number of files but to the remaining free space.
> Let me explain this.

I don't have a bookmark so I can't send you a direct link but it was 
mentioned before. refquota is similar to full pool in this case, so if 
you are close to or over 80% full, you will notice this slowdown.
You can try to search the web for details.

Miroslav Lachman