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    {
      "render_scene_cpu_ms": 0.280666,
      "summed_source_prepare_cpu_ms": 0.005000000000000001,
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    {
      "render_scene_cpu_ms": 0.29820800000000003,
      "summed_source_prepare_cpu_ms": 0.006206999999999999,
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    {
      "render_scene_cpu_ms": 0.217584,
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  ],
  "validated_capture": "/tmp/media-upload-bench.png",
  "caveats": [
    "CPU wall timings of render_scene and instrumented source preparation; not GPU timestamps or real window/UI frame rates.",
    "Sources decode/mip before timing; generated PNG creation and pipeline warmup are excluded. Decode/mip wall time is reported separately.",
    "Observed staging drain includes host polling and frame pacing; Metal/wgpu leases include completion callbacks. D3D11 reservations currently release at observed submission. Ready is host-submitted, not GPU-complete.",
    "Frame pacing sleeps and final pixel readback are excluded. Driver backpressure and instrumentation may affect CPU samples.",
    "Nearest-rank percentiles; sample counts are reported. Background system load is uncontrolled; this is one run, not a zero-stutter guarantee.",
    "Observed peaks are sampled once per rendered frame; source/staging budgets do not represent total process memory or VRAM."
  ]
}