The guidelines I'd read were about 15% IIRC; I believe there used to be a tech note on this, but I can no longer find it at apple.com. Most third-party sites discussing this cite 15%.

If OS X required us to never use half of our disk space that would be quite a public controversy, since that's far beyond what any other file system requires and would represent a tremendous waste of storage resources.

If you have poor performance on a Mac that has more than 15% free, chances are free space isn't the cause.

There may be other issues with the drive (+1 for Disk Warrior), or either the primary or a secondary drive has a power-scaling feature that lets the platter rest when not in use, or corrupted b-tree elements, or any number of other factors.

--
 Richard Gaskin
 Fourth World Systems
 Software Design and Development for the Desktop, Mobile, and the Web
 ____________________________________________________________________
 ambassa...@fourthworld.com                http://www.FourthWorld.com


John Balgenorth wrote:

10% might work for you but it definitely does not
work for me.  I have a 1tb drive and 348 gb free
space.  Most operations run slower than normal.
I deleted about 150gb of music to bring it up to
350gb because it ran too slow to use.  Now it
runs fast enough to use but I still have a lot of
wasted time.  I had a 350gb drive and had the
same problems way before 35gb free space.

John Balgenorth


On Jul 24, 2015, at 4:15 AM, Robert Brenstein <rjb at robelko.com> wrote:

A rule of thumb for Mac is 10% of drive being free...

I find iStat Menus a useful tool for continuous monitoring of vital parameters 
(just a happy user).

RObert


On 23.07.2015 at 15:37 Uhr -0700 JB apparently wrote:
If I remember correctly Bob Sneidar said that a
you need at least 1/2 of your hard drive as free
space to run efficiently.  So if you have a drive
with 500 GB you need 250 GB or more free
space on the drive.  Anything below that and
it normal operations like opening files will be
slower.  I have used more space than 1/2 and
the more I use the slower it gets.  Sometimes
you can speed things up a little by relaunching
the Finder.  That can be done using the Force
Quit option.  If it speeds things up it will only be
a temporary fix.

John Balgenorth


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