This thread comes up every year or two, try running Pd with JackOSX instead of having Pd communicate directly with OS X.  You should see the Pd process decrease it's CPU usage significantly.

My guess is it's a Pd-> PortAudio -> OS X thing.

Cheers,
~Brandon

On Thu, Oct 28, 2010 at 12:42 PM, Bernardo Barros <bernardobarros2@gmail.com> wrote:
I get this bug since 2005 on the mac...
maybe related to a broad issue in gui<->pd communication?

2010/10/28 Claude Heiland-Allen <claudiusmaximus@goto10.org>:
> Hi,
>
> On 28/10/10 16:41, Jamie Bullock wrote:
>>
>> Pd's idle CPU usage is 15-20%.
>> Does anyone know why this is?
>
> probably a bug..  you could try using gdb and interrupting Pd to see where
> it is being busy, or some profiling tool (gprof or strace or shark (?) or
> something else).
>
>> Is there anything that can be done to improve the situation?
>
> Try turning DSP on and then off again, maybe.
>
>
> Claude
>
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