Check out this video comparing the boot times of the iPad 1 vs. iPad 2 vs. iPad 3 on iOS 5.1.

Please note the video is synced on the down click of the power button. The logos are supposed to appear at different times.

Surprisingly, the boot time has got slightly slower over each generation; however, Apple has added new hardware features with each new model.

Take a look below...

via iclarified