Overall performance is still quicker than the 2011 models, as well as the i7 based 11-inch MBA from 2012. The 1.3GHz i5 regresses in performance by about 5%. The multithreaded performance story is a bit different. I'd like to say it's all because of cooling and turbo boost, but in all likelihood Apple is trading some of Haswell's IPC gains for frequency here - enabling identical performance, at lower clocks thanks to Haswell's more efficient architecture. As we found in our initial look at the new MBA, the 1.3GHz Core i5 CPU ends up performing about the same as last year's 1.8GHz part. Single threaded performance remains extremely important to overall system responsiveness, so it's always good to look at. This test also gives us the rare opportunity of comparing to some older Mac Pro hardware as well from 2008 - 2010. These next two charts look at single and multithreaded floating point performance using Cinebench 11.5. In practice the difference is subtle, but something you can appreciate as the 2013 MBA's IO is just snappier all over. The new 13-inch MBA's PCIe SSD takes the crown as it boots ever so slightly quicker than last year's setup. With the last generation of upgrades to 6Gbps SATA, we saw a good decrease in boot time over the previous generation platforms. To measure CPU performance we begin with a fairly standard measure of system responsiveness: boot time.
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