Do quota groups cost noticeable performance in 3.14?

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I was looking at using qgroups for my backup server, which will be
filled with millions of files in subvolumes with snapshots.

I read a warning that quota groups had performance issues, at least in
the past.

Is it still true? 
If there is a performance issue, is it as simple as just turning off
quota support and then things go back to normal?

Thanks,
Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/                         | PGP 1024R/763BE901
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