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Mac Pro Westmere RAW-file Import with Apple Aperture 3
See test machine configuration.
Apple Aperture 3.0.3 Import
Aperture performance is slightly slower than Lightroom 3. Results are about 1/3 slower if the face detection setting is enabled.
Note that 12 cores is only 8% faster than 6 cores— Aperture does not scale.

RAW-file Processing Speed — Import
Aperture 3 is not using the available CPU cores as well as it ought to.

CPU core usage with Aperture 3 while importing
2010 Mac Pro 6-core @ 3.33GHz
2010 Mac Pro 6-core @ 3.33GHz
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