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With Separations Preview on, the renderer copied every node of the document in every frame and separated each of its colors again. With Overprint Preview on, it copied each object with an overprinting fill or stroke in every frame, with the groups and layers that hold it. The copies were new Arcs, so the geometry, stroke outline and raster caches missed for each of them in every frame. In a release build, drawing a 2880x1800 frame of a 50,000-path document again with the same view and Separations Preview took 795 to 908 ms. The renderer now keeps the art it prepared and what it was made from, and in the next frame it uses that art again for each layer, symbol art and member that has not changed. Only the objects that changed are prepared again, with the layers and groups that hold them. All of the art is prepared again when Discard White Overprint changes and, with Separations Preview, when the plates shown, the proof setup, the swatches, the Spot Colors option or the color settings change or a profile is registered (cms::profiles_generation). The renderer now draws that frame again in 98 to 107 ms, with the same pixels. Docs: docs/target-app-parity.md.