Composition hardware doesn't have this step (it *is* the scanout hardware)
We thought about caching, but after doing measurements we found that it didn’t help, and it used a lot of memory for tiles.
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Web pages are so utterly trivial for modern GPUs when properly optimized (batching, Z-culling) that there’s little point in caching.
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In fact it’s kind of frustrating for demos—it’s so hard to demo WR saturating the GPU because CPU stuff ends up being the bottleneck :)
End of conversation
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Caching also has costs, hash generation, memory allocation, searching, invalidation logic and complexity.
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