According to the Anandtech review posted on another thread in this forum, the primary factor affecting performance of the iPad Air was heat dissipation. The iPad Air was able to dissipate heat much better than the iPhone 5s, thus allowing it to perform better for longer without being throttled due to heat. Considering the iPad Air and iPad mini retina will both feature the same processor, the main difference between the Air and mini retina will be the size of the device. The Air has a larger metal body to dissipate heat, which will allow apps to perform better for longer on the iPad Air while the mini retina will be more prone to overheating and throttling down. You can count on it. The iPad Air will be the better performing device.