Mac Book Pro with 2 or 4 core?

I use Lightroom a lot and am looking at getting a new Mac Book Pro to speed things up and to replace my Mac Book (I need a laptop for location tethered shooting)
Will I see a big difference between a 2 or 4 core model, or is the processor speed more importand? I've also read on another Adobe Forum that Hyperthreading is not fully implemented on LR 4.2.
Does anyone have recommendations for a Mac Book Pro model; preferably a 13" (for size/ location) unless you think the dual core will be too slow?
Thanks for any input.
Alan.

Multithreading in Lightroom is not as efficient as it could be so you are unlikely to see a 2x speed increase from going from 2 to 4 cores. Probably more like 1.4x or so depending on what you are doing so it is possible that higher clock rate will make up for fewer cores. I have a 4 core i7 Mac Book Pro retina and it is very fast in Lightroom but I have no frame of reference to compare to a dual core with the same level of processor. The retina display is gorgeous with Lightroom even though retina is not fully supported yet by Lightroom (in the Library module you get partial retina support), so I would recommend that machine in 13" if you have the cash especially since Adobe has already promised support in LR 4.

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