GPU Animation: Doing It Right
Most people now know that modern web browsers use the GPU to render parts of web pages, especially ones with animation. For example, a CSS animation using the transform
property looks much smoother than one using the left
and top
properties. But if you ask, “How do I get smooth animation from the GPU?” in most cases, you’ll hear something like, “Use transform: translateZ(0)
or will-change: transform
.”
These properties have become something like how we used zoom: 1
for Internet Explorer 6 (if you catch my drift) in terms of preparing animation for the GPU — or compositing, as browser vendors like to call it. But sometimes animation that is nice and smooth in a simple demo runs very slowly on a real website, introduces visual artifacts or even crashes the browser. Why does this happen? How do we fix it? Let’s try to understand.
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