The biggest trick the iPad performed really well from the beginning, Koch said, is to move around images in a way that makes every interaction feel snappy, fluid, physical. Everything from the silicon on up is optimized for images.
But there’s no comparable dedication to speedily rendering text. Try reading a text-heavy PDF on your iPad; even on the new model with the memory bump, you’ll notice that the text is out of focus for a moment, and then it sharpens up. That’s because rendering text on the iPad is actually more taxing on the device than flipping between images.
Read the full piece at wired.com