I just ran Aperture and it processed my library of photos at about 150 per minute. It took about 40 minutes to catalog my library of 6100 photos. I don't have much to gauge it against, but it seems to be considerably faster at that task than my Core 2 Duo-equipped MacBook Air was. The 4 cores stayed around 185 degrees Fahrenheit, and within 2 minutes of stopping had cooled down to about 120 degrees. Activity Monitor showed CPU utilization about 150-170% during the operation.