{
  "evidence": "E2 synthetic 300MiB single-writer; 20 rounds each",
  "limits": [
    "accelerated cadence clock, not wall-clock periodic device session",
    "5ms event-loop heartbeat not UI or device first sample",
    "macOS RSS bytes; block counters not physical I/O peaks",
    "no steady-state throughput or long session proof"
  ],
  "summary": {
    "off": {
      "medianMs": 679.7501330001978,
      "p95Ms": 878.095129999565,
      "maxMs": 943.1227220011351,
      "medianCpuMs": 661.5775,
      "peakRSSBytes": 35737600,
      "maxHeartbeatIntervalMs": 6.72176300031424,
      "medianFirstWriteMs": 22.59566900193022
    },
    "on": {
      "medianMs": 684.4775720010148,
      "p95Ms": 754.2829459998757,
      "maxMs": 991.1973880007281,
      "medianCpuMs": 660.1644999999999,
      "peakRSSBytes": 35762176,
      "maxHeartbeatIntervalMs": 6.724566999764647,
      "medianFirstWriteMs": 22.23175749895745
    }
  },
  "runs": [
    {
      "mode": "off",
      "wallMs": 847.3122659997898,
      "firstWriteMs": 21.681771000658046,
      "cpuMs": 684.324,
      "peakRSSBytes": 35549184,
      "maxHeartbeatIntervalMs": 6.604481999602285,
      "inputBlocks": 0,
      "outputBlocks": 0,
      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 1
    },
    {
      "mode": "on",
      "wallMs": 676.7406099988875,
      "firstWriteMs": 21.72144100040896,
      "cpuMs": 656.311,
      "peakRSSBytes": 35749888,
      "maxHeartbeatIntervalMs": 6.5084390007541515,
      "inputBlocks": 0,
      "outputBlocks": 0,
      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 1
    },
    {
      "mode": "on",
      "wallMs": 991.1973880007281,
      "firstWriteMs": 31.224959000610397,
      "cpuMs": 740.722,
      "peakRSSBytes": 35422208,
      "maxHeartbeatIntervalMs": 6.581648000064888,
      "inputBlocks": 0,
      "outputBlocks": 0,
      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 2
    },
    {
      "mode": "off",
      "wallMs": 943.1227220011351,
      "firstWriteMs": 42.64916000101948,
      "cpuMs": 724.2399999999999,
      "peakRSSBytes": 35430400,
      "maxHeartbeatIntervalMs": 6.596700999580207,
      "inputBlocks": 0,
      "outputBlocks": 0,
      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 2
    },
    {
      "mode": "off",
      "wallMs": 878.095129999565,
      "firstWriteMs": 29.105184999934863,
      "cpuMs": 684.484,
      "peakRSSBytes": 35479552,
      "maxHeartbeatIntervalMs": 6.52588199955062,
      "inputBlocks": 0,
      "outputBlocks": 0,
      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 3
    },
    {
      "mode": "on",
      "wallMs": 669.8132170004101,
      "firstWriteMs": 23.0894240012276,
      "cpuMs": 647.092,
      "peakRSSBytes": 35459072,
      "maxHeartbeatIntervalMs": 6.511859999591252,
      "inputBlocks": 0,
      "outputBlocks": 0,
      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 3
    },
    {
      "mode": "on",
      "wallMs": 682.7089140006137,
      "firstWriteMs": 20.545391000268864,
      "cpuMs": 652.9799999999999,
      "peakRSSBytes": 35442688,
      "maxHeartbeatIntervalMs": 6.493621000117855,
      "inputBlocks": 0,
      "outputBlocks": 0,
      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 4
    },
    {
      "mode": "off",
      "wallMs": 782.49304900055,
      "firstWriteMs": 23.57769899936102,
      "cpuMs": 694.7289999999999,
      "peakRSSBytes": 35364864,
      "maxHeartbeatIntervalMs": 6.72176300031424,
      "inputBlocks": 0,
      "outputBlocks": 0,
      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 4
    },
    {
      "mode": "off",
      "wallMs": 670.7970520001254,
      "firstWriteMs": 30.704643000717624,
      "cpuMs": 651.051,
      "peakRSSBytes": 35352576,
      "maxHeartbeatIntervalMs": 6.489131001217174,
      "inputBlocks": 0,
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      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 5
    },
    {
      "mode": "on",
      "wallMs": 683.7163500003953,
      "firstWriteMs": 21.78736099995149,
      "cpuMs": 655.564,
      "peakRSSBytes": 35299328,
      "maxHeartbeatIntervalMs": 6.724566999764647,
      "inputBlocks": 0,
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      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 5
    },
    {
      "mode": "on",
      "wallMs": 733.2928480009286,
      "firstWriteMs": 22.27811299962923,
      "cpuMs": 657.6419999999998,
      "peakRSSBytes": 35356672,
      "maxHeartbeatIntervalMs": 6.598898000447662,
      "inputBlocks": 0,
      "outputBlocks": 0,
      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 6
    },
    {
      "mode": "off",
      "wallMs": 648.8278879987774,
      "firstWriteMs": 20.89971900022647,
      "cpuMs": 633.798,
      "peakRSSBytes": 35536896,
      "maxHeartbeatIntervalMs": 6.482613000116544,
      "inputBlocks": 0,
      "outputBlocks": 0,
      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 6
    },
    {
      "mode": "off",
      "wallMs": 679.8723460015026,
      "firstWriteMs": 22.66620200134639,
      "cpuMs": 661.702,
      "peakRSSBytes": 35377152,
      "maxHeartbeatIntervalMs": 6.537595998452161,
      "inputBlocks": 0,
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      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 7
    },
    {
      "mode": "on",
      "wallMs": 696.711532998961,
      "firstWriteMs": 31.764948000272852,
      "cpuMs": 667.852,
      "peakRSSBytes": 35446784,
      "maxHeartbeatIntervalMs": 6.516860001283931,
      "inputBlocks": 0,
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      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 7
    },
    {
      "mode": "on",
      "wallMs": 696.002534001309,
      "firstWriteMs": 28.41721100048744,
      "cpuMs": 672.7379999999999,
      "peakRSSBytes": 35409920,
      "maxHeartbeatIntervalMs": 6.498041999293491,
      "inputBlocks": 0,
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      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 8
    },
    {
      "mode": "off",
      "wallMs": 696.988092000538,
      "firstWriteMs": 21.18067300034454,
      "cpuMs": 683.05,
      "peakRSSBytes": 35328000,
      "maxHeartbeatIntervalMs": 6.5595920004852815,
      "inputBlocks": 0,
      "outputBlocks": 0,
      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 8
    },
    {
      "mode": "off",
      "wallMs": 686.0814089995984,
      "firstWriteMs": 23.53275799941912,
      "cpuMs": 662.268,
      "peakRSSBytes": 35418112,
      "maxHeartbeatIntervalMs": 6.526847999339225,
      "inputBlocks": 0,
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      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 9
    },
    {
      "mode": "on",
      "wallMs": 681.121385001461,
      "firstWriteMs": 24.87266300158808,
      "cpuMs": 653.8989999999999,
      "peakRSSBytes": 35446784,
      "maxHeartbeatIntervalMs": 6.608104999031639,
      "inputBlocks": 0,
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      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 9
    },
    {
      "mode": "on",
      "wallMs": 675.4989650016796,
      "firstWriteMs": 21.70187900082965,
      "cpuMs": 652.871,
      "peakRSSBytes": 35561472,
      "maxHeartbeatIntervalMs": 6.49308399988513,
      "inputBlocks": 0,
      "outputBlocks": 0,
      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 10
    },
    {
      "mode": "off",
      "wallMs": 662.6891800005978,
      "firstWriteMs": 22.031398000763147,
      "cpuMs": 646.337,
      "peakRSSBytes": 35430400,
      "maxHeartbeatIntervalMs": 6.5249339986621635,
      "inputBlocks": 0,
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      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 10
    },
    {
      "mode": "off",
      "wallMs": 673.6430080018181,
      "firstWriteMs": 25.240179002139485,
      "cpuMs": 656.5450000000001,
      "peakRSSBytes": 35684352,
      "maxHeartbeatIntervalMs": 6.622961998800747,
      "inputBlocks": 0,
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      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 11
    },
    {
      "mode": "on",
      "wallMs": 687.0453570008976,
      "firstWriteMs": 21.09939900037716,
      "cpuMs": 662.687,
      "peakRSSBytes": 35495936,
      "maxHeartbeatIntervalMs": 6.536911001603585,
      "inputBlocks": 0,
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      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 11
    },
    {
      "mode": "on",
      "wallMs": 754.2829459998757,
      "firstWriteMs": 28.79728200059617,
      "cpuMs": 691.9799999999999,
      "peakRSSBytes": 35393536,
      "maxHeartbeatIntervalMs": 6.557497999892803,
      "inputBlocks": 0,
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      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 12
    },
    {
      "mode": "off",
      "wallMs": 660.297589001857,
      "firstWriteMs": 23.31665800011251,
      "cpuMs": 640.625,
      "peakRSSBytes": 35491840,
      "maxHeartbeatIntervalMs": 6.507617003080668,
      "inputBlocks": 0,
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      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 12
    },
    {
      "mode": "off",
      "wallMs": 686.96364599964,
      "firstWriteMs": 21.85897000163095,
      "cpuMs": 664.9009999999998,
      "peakRSSBytes": 35487744,
      "maxHeartbeatIntervalMs": 6.553907998750219,
      "inputBlocks": 0,
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      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 13
    },
    {
      "mode": "on",
      "wallMs": 672.8204440005356,
      "firstWriteMs": 21.370259000832448,
      "cpuMs": 643.426,
      "peakRSSBytes": 35368960,
      "maxHeartbeatIntervalMs": 6.508365000627236,
      "inputBlocks": 0,
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      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 13
    },
    {
      "mode": "on",
      "wallMs": 688.52348099972,
      "firstWriteMs": 30.387151000468293,
      "cpuMs": 666.25,
      "peakRSSBytes": 35303424,
      "maxHeartbeatIntervalMs": 6.664103999355575,
      "inputBlocks": 0,
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      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 14
    },
    {
      "mode": "off",
      "wallMs": 665.7879960002901,
      "firstWriteMs": 23.75906100132852,
      "cpuMs": 649.3870000000001,
      "peakRSSBytes": 35622912,
      "maxHeartbeatIntervalMs": 6.546591001097113,
      "inputBlocks": 0,
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      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 14
    },
    {
      "mode": "off",
      "wallMs": 669.17568700228,
      "firstWriteMs": 31.159008001850452,
      "cpuMs": 652.9350000000001,
      "peakRSSBytes": 35409920,
      "maxHeartbeatIntervalMs": 6.513686999824131,
      "inputBlocks": 0,
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      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 15
    },
    {
      "mode": "on",
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      "maxHeartbeatIntervalMs": 6.484604000434047,
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      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 15
    },
    {
      "mode": "on",
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      "peakRSSBytes": 35332096,
      "maxHeartbeatIntervalMs": 6.611971999518573,
      "inputBlocks": 0,
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      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 16
    },
    {
      "mode": "off",
      "wallMs": 664.8500119990786,
      "firstWriteMs": 21.36352800152963,
      "cpuMs": 655.0699999999999,
      "peakRSSBytes": 35737600,
      "maxHeartbeatIntervalMs": 6.558560002304148,
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      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 16
    },
    {
      "mode": "off",
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      "peakRSSBytes": 35385344,
      "maxHeartbeatIntervalMs": 6.642349999310682,
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      "payloadBytes": 314572800,
      "round": 17
    },
    {
      "mode": "on",
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      "firstWriteMs": 22.428222000598907,
      "cpuMs": 666.8009999999999,
      "peakRSSBytes": 35557376,
      "maxHeartbeatIntervalMs": 6.443381000281079,
      "inputBlocks": 0,
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      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 17
    },
    {
      "mode": "on",
      "wallMs": 679.5109349986888,
      "firstWriteMs": 21.13715399900684,
      "cpuMs": 664.224,
      "peakRSSBytes": 35762176,
      "maxHeartbeatIntervalMs": 6.470749998698011,
      "inputBlocks": 0,
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      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 18
    },
    {
      "mode": "off",
      "wallMs": 698.6750920004852,
      "firstWriteMs": 22.08792999954312,
      "cpuMs": 667.0749999999999,
      "peakRSSBytes": 35426304,
      "maxHeartbeatIntervalMs": 6.568081000295933,
      "inputBlocks": 0,
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      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 18
    },
    {
      "mode": "off",
      "wallMs": 677.6543359992502,
      "firstWriteMs": 22.525136002514046,
      "cpuMs": 667.7739999999999,
      "peakRSSBytes": 35373056,
      "maxHeartbeatIntervalMs": 6.549706999066984,
      "inputBlocks": 0,
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      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 19
    },
    {
      "mode": "on",
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      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 19
    },
    {
      "mode": "on",
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      "peakRSSBytes": 35409920,
      "maxHeartbeatIntervalMs": 6.480583997472422,
      "inputBlocks": 0,
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      "checkpointCount": 2,
      "payloadBytes": 314572800,
      "round": 20
    },
    {
      "mode": "off",
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      "maxHeartbeatIntervalMs": 6.483813001977978,
      "inputBlocks": 0,
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      "checkpointCount": 0,
      "payloadBytes": 314572800,
      "round": 20
    }
  ]
}