Animations
The Animations panel is located in the Customize->Basic accordion menu in the chart editor. The options presented let you set the duration of the opening animation sequence when a chart is loaded.
Animation
Animation duration (ms): You can set the time duration in miliseconds of the opening animation that plays when a chart is loaded. Enter a positive numeric value or use the up and down arrows to increase or decrease the value already entered.
Load chart on page load: On and checked means that the chart will be loaded and its animation played as soon as the page is loaded, even if the chart isn't in view of the user. Off and unchecked disables this behaviour.