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With Type › Show Hidden Characters on, the canvas laid out every visible text object in view in every frame to place the dots on spaces and the ¶ and # marks. With 1,000 two-line labels in view, drawing the marks took a median of 19.7 ms per frame in a release build. The overlay now keeps each text object's marks in document space, together with the node it laid them out from. In a frame it lays out a text object only when its node is a new `Arc` (an edit makes one) or the frame before did not draw it, and it lays out all type in view again when the fonts or the hyphenation exceptions change. The marks are still placed for the current view in every frame. With the same labels, drawing the marks takes 0.8 ms per frame, and the shapes drawn are the same as before. Docs: docs/target-app-parity.md.