John Poole, the founder of Primate Labs, notes that the results are not surprising. "Both models use Intel Haswell processors, so there are no major changes in processor technology. The 5-7% increase in performance is what I would expect from the 7% increase in processor frequency."
Notably, the new model is quite a bit faster that the 2011 and 2012 MacBook Air models. Single-core performance has improved by almost 45% since 2011 and almost 20% since 2012. However, those thinking about an upgrade might want to remember that Apple is rumored to be releasing a new 12-inch Retina Display MacBook.
Take a look at the benchmarks below...