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  "notes": [
    "One immutable scene per case/DPI. Before swaps only _area with our own previous snapshot.",
    "Serial alternating calls; raster timings exclude composition, hash, PNG/SVG encoding and I/O.",
    "No concurrent profiling/measurement sampler, geometry simplification or Tk frame cache.",
    "Small local samples; caches warm across calls. Not a statistical or visible-input latency guarantee.",
    "Terrain/vector/point values are synthetic. Bundled boundaries generalized; optional municipal source not redistributed."
  ],
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}