An animation generation instruction identifying key frames to use for generating an animation is received. A plurality of tweens corresponding to the animation are obtained, where each tween includes tween objects between a start key frame and an end key frame. One or more timelines are generated when a quantity of tweens is greater than or equal to two, where each timeline corresponds to one or more tweens, and where a quantity of timelines is less than the quantity of tweens. The animation is generated using the plurality of tweens based on the one or more timelines.