> On May 9, 2020, at 08:51, Gabriel Zachmann via Cocoa-dev 
> <cocoa-dev@lists.apple.com> wrote:
> 
> 
>> 
>> 
>> Try Instruments. Apple have written a measuring tool for a reason :)
> 
> Thanks for the hint.
> 
> I've done that.
> In the Heaviest Stack Trace, I am seeing functions like 
> CA::Transcation::commit()
> CA::Render::copy_image(..)
> CI::recursive_tile(..)
> etc

If an image is huge and/or highres, it’s naturally going to take more time to 
render. I’d experiment and see if pre-sizing images before passing them onto 
the layer will be more efficient. Probably not, but it seems like some parts of 
the various Mac image frameworks do a better job of scaling than others.

Steve via iPad

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