[asawilliams]

why not use css transforms for the transitions?

[itsmonktastic]

The tutorial uses Zepto for animations, which backs onto CSS transforms.

"Zepto exclusively uses CSS transitions for effects and animation. jQuery easings are not supported."

From http://zeptojs.com/#animate

[asawilliams]

doesnt look like they implement 3d transforms which is where the performance would come from.

[mortenjorck]

This is an especially pertinent question as CSS transforms tend to be hardware-accelerated on mobile Webkit, playing more smoothly and using less battery, while jQuery animations tend not to be.