There was already a discussion about this, search for the subject 'Pharo on Mac 
OS X 10.9 Mavericks’.

On 28 Oct 2013, at 18:37, Thomas Kendelbacher <[email protected]> wrote:

> A greater than, say, 1% base CPU load from an otherwise idle application 
> would indicate that it's doing some busy waiting somewhere... in my Activity 
> Monitor, I don't see too many processes doing that, so just using an ObjC 
> framework doesn't seem to be the guilty part.  By the way, very old versions 
> of VisualWorks used to be bad in that way, but not any more; so there is 
> something that can be done about it.
> 
> A large virtual memory working set wouldn't help either for power efficiency, 
> though with today's RAM sizes it's probably less important.
> 
> On Oct 28, 2013, at 11:46, Yuriy Tymchuk <[email protected]> wrote:
>> It’s not about the thing that it uses 5% CPU. Apple does some magic with 
>> optimisation so they group threads in order to reduce power usage. And Pharo 
>> is not good at that. I’m not telling that Pharo is slow. Battery lasts 
>> longer with Safari compared to Chrome. Probably with Pharo it’s something 
>> similar.
>> 
>> On 28 Oct 2013, at 17:31, dimitris chloupis <[email protected]> wrote:
>>> I would not worry too much over this. I have MenuMeters even before I was 
>>> introduced to smalltalk over a year ago and Pharo is steadily reported 
>>> consuming a 5% of my CPU which is average for an ObjC app on Macos 10.7 
>>> 
>>> http://www.ragingmenace.com/software/menumeters/
>>> 
>>> So personally I am impressed with pharo speed so far. A big thumbs up from 
>>> me. Also take into account that even though MacOS is a great OS it comes 
>>> with its own fair share of bugs, especially the first year of its release 
>>> so I would not put too much attention into this if I was you.
>>> 
>>> On Monday, 28 October 2013, 18:08, Yuriy Tymchuk <[email protected]> 
>>> wrote:
>>> Now with Mavericks we can tell that Pharo is hungry for energy :)
>>> 
>>> <Screenshot 2013-10-28 17.05.48.png>
>>> 
>>> Cheers!
>>> Uko
> 


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