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Turn off 'parallax' motion user interface
If you slowly jiggle your iPhone in your hand, you may notice the "parallax" effect of three-dimensional icons sitting on top of your wallpaper. This effect uses internal hardware to sense the direction, speed, and motion of your movements. This, as you might expect, will drain the battery. Though flashy and visually quite cool, it's not wholly necessary if you're a power user.
To disable the "moving wallpaper" feature, head to Settings > General > Accessibility > Reduce Motion, then flick the switch in the on position.