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When a read document is brought within the canvas, each saved guide was checked against the removed artboard ids and the removed layer ids with linear scans, and each guide node against the removed artboard ids, so the work grew with the number of guides times the number of removed ids. The ids are now collected into ordered sets, and each guide is checked in logarithmic time. Removing what lies beyond the canvas scanned each container's whole subtree to see whether anything reached beyond, then scanned each child again while removing, one level down at a time, so a deeply nested object was measured once for every group around it. Removing guide nodes probed each layer's subtree the same way before descending into its sublayers. Both now make one read-only walk that records, by index, which objects reach beyond (or which guides are removed), and the removal follows that record. The objects clipped by a clipping path beyond the canvas are still not measured. Containers with nothing to remove are still not copied. The objects and guides that remain, their order, the counts, the retired artboard ids and the saved selections are unchanged.