Data-AnimationSpeed
From Documentation
To change the animation speed, you can apply data-animationspeed attribute. The valid value can be any integer, 'slow' or 'fast', same as jQuery. When you specify 0 as the value, it means no animation.
<div xmlns:ca="client/attribute">
<panel title="Panel" width="500px" border="normal" collapsible="true" ca:data-animationspeed="0">
<panelchildren>panel content</panelchildren>
</panel>
</div>
since 7.0.3