AsyncDisplayKit/_docs/subtree-rasterization.md

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Flattening an entire view hierarchy into a single layer improves performance, but with UIKit, comes with a hit to maintainability and hierarchy-based reasoning.

With all AsyncDisplayKit nodes, enabling precompositing is as simple as:

rootNode.shouldRasterizeDescendants = YES;

This line will cause the entire node hierarchy from that point on to be rendered into one layer.