
With the introduction of its new Haswell-based MacBook Air models yesterday, Apple revealed a strong emphasis on battery life, pushing the rated operating time from five hours to nine hours on the 11-inch model and from seven hours to 12 hours on the 13-inch model.
Even with the focus on battery life, Apple was also able to bring some minor performance improvements, as seen in Geekbench 2 benchmarking results highlighted by Primate Labs. Overall, the new MacBook Air models performed 3-8% better than their previous-generation counterparts.
With Haswell, Intel's focus was on reducing power usage. Rather than improve performance by 25%, Intel improved performance by 10% while consuming 25% less power.
Apple then went a step further. Apple reduced power usage even more by selecting processors with lower frequencies. In the low-end Air, the frequency has been reduced to 1.3 GHz from 1.7 GHz, while in the high-end Air, the frequency has been reduced to 1.7 GHz from 2.0 GHz.

Article Link: Haswell-Based MacBook Airs See Minor Speed Boosts Alongside Battery Life Focus