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Delete, Cut, Group, Make Compound Path, Make Clipping Mask, Send to Current Layer, Ungroup and Release Compound Path removed, inserted or moved one object at a time. duplicate_in inserted one copy at a time; Duplicate, Copy in the Move, Rotate, Scale, Reflect and Shear dialogs, Transform Again after a copy, Transform Each with Copy, the perspective copies and each move of an Alt-drag call it. Each insertion or removal moved the later objects of the same layer or group to other indices. The next lookup by id then walked the tree, and after every fourth such walk Document::index_path rebuilt the whole lookup cache. Each command did work that grew with the number of objects times the size of the document: with 25,000 rectangles selected, a release build of vectorcraft-cli took 7.2 s to group them and 11.5 s to copy them with object.transform. Document::remove_many, Document::wrap and Document::insert_beside remove nodes, wrap them in a new node, or put nodes directly above or in place of their anchors, in one pass over the children of each parent. Each finds the nodes with one index_paths call, checks every id before it changes anything, and clears the lookup cache once. The commands above use them. The objects keep their order, the copies take their ids in the same order, and the selection, the undo step and the journal are the same. duplicate_in still copies one root at a time when a root is listed twice or lies inside another root. A release build with this change groups the 25,000 rectangles in 27 ms and copies them in 121 ms. Docs: docs/target-app-parity.md.