Exactly. On iOS Core Animation composites cached layers, as rendering them was slow. Modern GPU stacks are making this step obsolete.
This is why compositors are a bad fit for browsers: the CSS model is a complex scene graph, not pixels of rectangles.
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Yup, until you need to go cross process. Or scroll one viewport inside another
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We solved both problems in WebRender. Export display lists across IPC, and have the notion of scroll roots deeply integrated into rendering.
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