{
  "measured": "2026-08-29 (foreground window, M2, Metal, vsync off)",
  "method": "per-frame CPU LBS + full ArrayMesh rebuild (current default)",
  "caveats": [
    "frame_ms is the trustworthy signal; cpu_process_ms (Performance.TIME_PROCESS) reads inconsistent (drops as N rises) \u2014 do not use.",
    "per-frame cpu_mesh->clear_surfaces()+add_surface_from_arrays is the likely bottleneck, not the LBS math.",
    "build ~170ms/char is single-threaded, no cross-model texture/mesh cache.",
    "Phase 2 needs: (1) custom GPU skinning shader (full bone matrices) so this path is not on the CPU, (2) multithreaded build + eterpack shared assets, (3) a proper bench harness."
  ],
  "runs": [
    {
      "characters": 1,
      "build_ms_per_char": 171.7,
      "frame_ms_avg": 21.8,
      "fps_avg": 46.0
    },
    {
      "characters": 10,
      "build_ms_per_char": 171.1,
      "frame_ms_avg": 27.5,
      "fps_avg": 36.3
    },
    {
      "characters": 30,
      "build_ms_per_char": 168.7,
      "frame_ms_avg": 41.2,
      "fps_avg": 24.3
    }
  ]
}