I'm experiencing unexpectedly slow performance on Aperture on a new 15-inch Retina MBP, 16GB, Nvidia graphics. It's not bad, per se, but what is noticeable is that it's barely taxing the processor. I've not seen it take more than about 250 percent of processor on Activity monitor whereas on my 2011 quad core it spikes it all the way to 800 percent with hyper threading. While the import from card is respectable-- a 29.66GB import from a fast CF card this morning took just over seven minutes--things like face detection run quite slowly; that same import took almost 16 minutes to go through face detection (a total of 1,600 files, a mix of JPEG and raw), with the processor all the while chugging along at a leisurely 100 percent, the equivalent of just one non-hyperthreaded core. This face detection is quite significantly slower than on the Sandy Bridge 2011 quad core, even while the import is faster due to the USB 3 and flash architecture. Do I have something configured wrong, is there something wrong with my computer, or does Aperture simply not exploit the Haswell processor? Or is everything just fine? Or does Activity Monitor not report Haswell CPU usage properly?