Animation Editing – Timing & Spacing
The number of drawings used in any move determines the amount of time that action will take on the screen
The Illusion of Life: Disney Animation – Frank Thomas and Ollie Johnston
A firm grasp of timing for animation is a key principle to understand. Timing can have a strong impact on both the pacing of an animation sequence and the believability of physical motion.
With regards to physical motion or character animation, if the timing is off, it will be immediately noticeable to the viewer that the animation is wrong, the sense of physical weight, mass, and inertia will be lost. With regards to pacing ...