All Existing iPads Boot Speed Test - Video
The testing conditions were identical for each device. All seven tablets were restored to the latest version of iOS available (iOS 7.0.4 for everyone except for the iPad 1). Gadgets were fully charged and there were no SIM cards inside.
The counter was started from the exact moment each device received USB signal and stopped as soon as slide-to-unlock appeared.
The newly-released iPad Air was the first to boot and the 7.9-inch iPad mini (1st generation) - the last.