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I don't think the goal of an animated glowing form is to minimize CPU usage, so this is a bit of a non sequitur.

I thought one goal of using CSS3 is to have super performant animations.

That may be the one goal, but I think probably a bigger goal is to have animations that are handled by the browser itself (and not Flash), and can be written in lightweight code.

I thought that was the point of WebGL?

Honestly, this is the first I've heard of CSS3 animations as intending to be ultra-fast, but I admittedly haven't kept up on the HTML5/CSS3 discussions.

Can you cite a reference for me please?

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