Mobile technology moves at an insane speed. Every year brings about faster and faster processors that make last year's "super fast" devices seem pathetically slow.

The YouTube channel EverythingApplePro decided it would be fun to take every single iPad model ever created — all 12 of them right up to the new 9.7-inch and 12.9-inch iPad Pro — and compare them through a series of speed, power, and Wi-Fi tests. There's even a thermal gun test. Some of the results will surprise you!