{
  "schemaVersion": 1,
  "generatedAt": "2026-07-21T21:43:54.899Z",
  "environment": {
    "node": "v26.5.0",
    "platform": "darwin",
    "arch": "arm64"
  },
  "fixture": {
    "chunks": 100000,
    "samples": 5,
    "uploadBatchBytes": 8388608
  },
  "note": "Each row is a fresh process; maxRSS is process.resourceUsage().maxRSS. The ordered chunks table remains live through final GC.",
  "decision": {
    "status": "accepted_by_explicit_user_tradeoff",
    "productionMode": "cursor-clear-4096",
    "reason": "The candidate is not Pareto-superior: the user explicitly accepted the measured RSS cost in exchange for the CPU/wall-time reduction.",
    "currentVsProduction": {
      "prefilled": {
        "wallSpeedup": 246.783,
        "maxRssDeltaBytes": 458752,
        "peakRssDeltaDeltaBytes": 131072,
        "retainedRssDeltaDeltaBytes": 458752,
        "retainedHeapDeltaDeltaBytes": -3080
      },
      "streamingAhead": {
        "wallSpeedup": 37.137,
        "maxRssDeltaBytes": 491520,
        "peakRssDeltaDeltaBytes": 507904,
        "retainedRssDeltaDeltaBytes": 1032192,
        "retainedHeapDeltaDeltaBytes": -3576
      },
      "streamingBalanced": {
        "wallSpeedup": 1.184,
        "maxRssDeltaBytes": 114688,
        "peakRssDeltaDeltaBytes": 163840,
        "retainedRssDeltaDeltaBytes": 0,
        "retainedHeapDeltaDeltaBytes": 3168
      }
    }
  },
  "results": [
    {
      "shape": "prefilled",
      "mode": "current-shift",
      "wallMedianMs": 3526.774,
      "maxRssBytesMedian": 71516160,
      "peakRssDeltaBytesMedian": 606208,
      "retainedRssDeltaBytesMedian": 180224,
      "retainedHeapDeltaBytesMedian": 265536,
      "maxRssSamplesBytes": [
        71335936,
        71516160,
        71974912,
        71368704,
        72220672
      ],
      "peakRssDeltaSamplesBytes": [
        557056,
        81920,
        606208,
        622592,
        622592
      ],
      "compactions": 0
    },
    {
      "shape": "prefilled",
      "mode": "cursor-clear-1024",
      "wallMedianMs": 11.252,
      "maxRssBytesMedian": 71745536,
      "peakRssDeltaBytesMedian": 606208,
      "retainedRssDeltaBytesMedian": 475136,
      "retainedHeapDeltaBytesMedian": 262240,
      "maxRssSamplesBytes": [
        71172096,
        72105984,
        71974912,
        71745536,
        71680000
      ],
      "peakRssDeltaSamplesBytes": [
        671744,
        1015808,
        540672,
        606208,
        540672
      ],
      "compactions": 7
    },
    {
      "shape": "prefilled",
      "mode": "cursor-clear-4096",
      "wallMedianMs": 14.291,
      "maxRssBytesMedian": 71974912,
      "peakRssDeltaBytesMedian": 737280,
      "retainedRssDeltaBytesMedian": 638976,
      "retainedHeapDeltaBytesMedian": 262456,
      "maxRssSamplesBytes": [
        71991296,
        71516160,
        70926336,
        71974912,
        72007680
      ],
      "peakRssDeltaSamplesBytes": [
        933888,
        622592,
        720896,
        737280,
        802816
      ],
      "compactions": 5
    },
    {
      "shape": "prefilled",
      "mode": "cursor-clear-16384",
      "wallMedianMs": 13.354,
      "maxRssBytesMedian": 71794688,
      "peakRssDeltaBytesMedian": 573440,
      "retainedRssDeltaBytesMedian": 262144,
      "retainedHeapDeltaBytesMedian": 262264,
      "maxRssSamplesBytes": [
        71794688,
        72417280,
        71909376,
        71434240,
        71794688
      ],
      "peakRssDeltaSamplesBytes": [
        573440,
        720896,
        524288,
        573440,
        638976
      ],
      "compactions": 3
    },
    {
      "shape": "prefilled",
      "mode": "cursor-no-clear-4096",
      "wallMedianMs": 22.188,
      "maxRssBytesMedian": 71942144,
      "peakRssDeltaBytesMedian": 737280,
      "retainedRssDeltaBytesMedian": 589824,
      "retainedHeapDeltaBytesMedian": 262432,
      "maxRssSamplesBytes": [
        71942144,
        73351168,
        71335936,
        71647232,
        72433664
      ],
      "peakRssDeltaSamplesBytes": [
        786432,
        802816,
        737280,
        622592,
        720896
      ],
      "compactions": 5
    },
    {
      "shape": "prefilled",
      "mode": "cursor-splice-4096",
      "wallMedianMs": 11.975,
      "maxRssBytesMedian": 72417280,
      "peakRssDeltaBytesMedian": 1589248,
      "retainedRssDeltaBytesMedian": 1392640,
      "retainedHeapDeltaBytesMedian": 262456,
      "maxRssSamplesBytes": [
        72646656,
        72220672,
        72269824,
        72417280,
        72679424
      ],
      "peakRssDeltaSamplesBytes": [
        1441792,
        1605632,
        1474560,
        1589248,
        1589248
      ],
      "compactions": 5
    },
    {
      "shape": "prefilled",
      "mode": "cursor-splice-16384",
      "wallMedianMs": 9.151,
      "maxRssBytesMedian": 72286208,
      "peakRssDeltaBytesMedian": 1441792,
      "retainedRssDeltaBytesMedian": 1441792,
      "retainedHeapDeltaBytesMedian": 263584,
      "maxRssSamplesBytes": [
        72138752,
        75939840,
        71516160,
        72318976,
        72286208
      ],
      "peakRssDeltaSamplesBytes": [
        1310720,
        1474560,
        1441792,
        1441792,
        1294336
      ],
      "compactions": 3
    },
    {
      "shape": "prefilled",
      "mode": "cursor-slice-4096",
      "wallMedianMs": 9.405,
      "maxRssBytesMedian": 72548352,
      "peakRssDeltaBytesMedian": 1540096,
      "retainedRssDeltaBytesMedian": 1540096,
      "retainedHeapDeltaBytesMedian": 262456,
      "maxRssSamplesBytes": [
        72187904,
        72548352,
        72744960,
        72843264,
        72286208
      ],
      "peakRssDeltaSamplesBytes": [
        1556480,
        1540096,
        1556480,
        1523712,
        1523712
      ],
      "compactions": 5
    },
    {
      "shape": "prefilled",
      "mode": "cursor-reset-4096",
      "wallMedianMs": 14.182,
      "maxRssBytesMedian": 71729152,
      "peakRssDeltaBytesMedian": 704512,
      "retainedRssDeltaBytesMedian": 475136,
      "retainedHeapDeltaBytesMedian": 261768,
      "maxRssSamplesBytes": [
        71778304,
        71729152,
        71696384,
        71581696,
        71761920
      ],
      "peakRssDeltaSamplesBytes": [
        999424,
        638976,
        737280,
        704512,
        655360
      ],
      "compactions": 5
    },
    {
      "shape": "streaming-ahead",
      "mode": "current-shift",
      "wallMedianMs": 616.473,
      "maxRssBytesMedian": 74153984,
      "peakRssDeltaBytesMedian": 3948544,
      "retainedRssDeltaBytesMedian": 4145152,
      "retainedHeapDeltaBytesMedian": 1066792,
      "maxRssSamplesBytes": [
        74219520,
        76283904,
        74153984,
        73383936,
        74006528
      ],
      "peakRssDeltaSamplesBytes": [
        3997696,
        3964928,
        3850240,
        3948544,
        3932160
      ],
      "compactions": 0
    },
    {
      "shape": "streaming-ahead",
      "mode": "cursor-clear-1024",
      "wallMedianMs": 12.093,
      "maxRssBytesMedian": 74661888,
      "peakRssDeltaBytesMedian": 4374528,
      "retainedRssDeltaBytesMedian": 4915200,
      "retainedHeapDeltaBytesMedian": 1063520,
      "maxRssSamplesBytes": [
        73924608,
        74661888,
        74235904,
        74809344,
        74727424
      ],
      "peakRssDeltaSamplesBytes": [
        4194304,
        4374528,
        4390912,
        4308992,
        4505600
      ],
      "compactions": 7
    },
    {
      "shape": "streaming-ahead",
      "mode": "cursor-clear-4096",
      "wallMedianMs": 16.6,
      "maxRssBytesMedian": 74645504,
      "peakRssDeltaBytesMedian": 4456448,
      "retainedRssDeltaBytesMedian": 5177344,
      "retainedHeapDeltaBytesMedian": 1063216,
      "maxRssSamplesBytes": [
        74645504,
        74334208,
        73891840,
        74678272,
        75120640
      ],
      "peakRssDeltaSamplesBytes": [
        4440064,
        4505600,
        4456448,
        4407296,
        4489216
      ],
      "compactions": 5
    },
    {
      "shape": "streaming-ahead",
      "mode": "cursor-clear-16384",
      "wallMedianMs": 19.843,
      "maxRssBytesMedian": 74612736,
      "peakRssDeltaBytesMedian": 4358144,
      "retainedRssDeltaBytesMedian": 5242880,
      "retainedHeapDeltaBytesMedian": 1063784,
      "maxRssSamplesBytes": [
        75186176,
        74350592,
        74760192,
        74465280,
        74612736
      ],
      "peakRssDeltaSamplesBytes": [
        4653056,
        4390912,
        4308992,
        4325376,
        4358144
      ],
      "compactions": 3
    },
    {
      "shape": "streaming-ahead",
      "mode": "cursor-no-clear-4096",
      "wallMedianMs": 16.406,
      "maxRssBytesMedian": 74629120,
      "peakRssDeltaBytesMedian": 4390912,
      "retainedRssDeltaBytesMedian": 5423104,
      "retainedHeapDeltaBytesMedian": 1063640,
      "maxRssSamplesBytes": [
        74530816,
        74940416,
        74629120,
        74645504,
        74383360
      ],
      "peakRssDeltaSamplesBytes": [
        4489216,
        4489216,
        4325376,
        4374528,
        4390912
      ],
      "compactions": 5
    },
    {
      "shape": "streaming-ahead",
      "mode": "cursor-splice-4096",
      "wallMedianMs": 12.952,
      "maxRssBytesMedian": 75218944,
      "peakRssDeltaBytesMedian": 5292032,
      "retainedRssDeltaBytesMedian": 5718016,
      "retainedHeapDeltaBytesMedian": 1063216,
      "maxRssSamplesBytes": [
        75087872,
        75382784,
        75218944,
        75317248,
        75038720
      ],
      "peakRssDeltaSamplesBytes": [
        5292032,
        5210112,
        5308416,
        5242880,
        5341184
      ],
      "compactions": 5
    },
    {
      "shape": "streaming-ahead",
      "mode": "cursor-splice-16384",
      "wallMedianMs": 10.851,
      "maxRssBytesMedian": 75661312,
      "peakRssDeltaBytesMedian": 5210112,
      "retainedRssDeltaBytesMedian": 5914624,
      "retainedHeapDeltaBytesMedian": 1063704,
      "maxRssSamplesBytes": [
        76627968,
        75399168,
        75661312,
        75726848,
        75022336
      ],
      "peakRssDeltaSamplesBytes": [
        5357568,
        5210112,
        5193728,
        5193728,
        5275648
      ],
      "compactions": 3
    },
    {
      "shape": "streaming-ahead",
      "mode": "cursor-slice-4096",
      "wallMedianMs": 11.689,
      "maxRssBytesMedian": 75792384,
      "peakRssDeltaBytesMedian": 5242880,
      "retainedRssDeltaBytesMedian": 6111232,
      "retainedHeapDeltaBytesMedian": 1064056,
      "maxRssSamplesBytes": [
        75792384,
        75923456,
        75644928,
        75218944,
        76185600
      ],
      "peakRssDeltaSamplesBytes": [
        5324800,
        5242880,
        5177344,
        5242880,
        5586944
      ],
      "compactions": 5
    },
    {
      "shape": "streaming-ahead",
      "mode": "cursor-reset-4096",
      "wallMedianMs": 15.48,
      "maxRssBytesMedian": 75005952,
      "peakRssDeltaBytesMedian": 4390912,
      "retainedRssDeltaBytesMedian": 5095424,
      "retainedHeapDeltaBytesMedian": 1062848,
      "maxRssSamplesBytes": [
        75005952,
        75005952,
        75448320,
        74498048,
        74743808
      ],
      "peakRssDeltaSamplesBytes": [
        4489216,
        4325376,
        4702208,
        4390912,
        4341760
      ],
      "compactions": 5
    },
    {
      "shape": "streaming-balanced",
      "mode": "current-shift",
      "wallMedianMs": 12.637,
      "maxRssBytesMedian": 72941568,
      "peakRssDeltaBytesMedian": 2752512,
      "retainedRssDeltaBytesMedian": 3571712,
      "retainedHeapDeltaBytesMedian": 1066272,
      "maxRssSamplesBytes": [
        72941568,
        72941568,
        72876032,
        76644352,
        73334784
      ],
      "peakRssDeltaSamplesBytes": [
        2752512,
        2785280,
        2736128,
        2752512,
        2834432
      ],
      "compactions": 0
    },
    {
      "shape": "streaming-balanced",
      "mode": "cursor-clear-1024",
      "wallMedianMs": 11.721,
      "maxRssBytesMedian": 73302016,
      "peakRssDeltaBytesMedian": 2932736,
      "retainedRssDeltaBytesMedian": 3506176,
      "retainedHeapDeltaBytesMedian": 1068736,
      "maxRssSamplesBytes": [
        74792960,
        73662464,
        73302016,
        73187328,
        73170944
      ],
      "peakRssDeltaSamplesBytes": [
        2818048,
        2949120,
        2899968,
        2932736,
        3047424
      ],
      "compactions": 0
    },
    {
      "shape": "streaming-balanced",
      "mode": "cursor-clear-4096",
      "wallMedianMs": 10.671,
      "maxRssBytesMedian": 73056256,
      "peakRssDeltaBytesMedian": 2916352,
      "retainedRssDeltaBytesMedian": 3571712,
      "retainedHeapDeltaBytesMedian": 1069440,
      "maxRssSamplesBytes": [
        73875456,
        72695808,
        73891840,
        73056256,
        72990720
      ],
      "peakRssDeltaSamplesBytes": [
        2850816,
        2916352,
        2932736,
        2981888,
        2834432
      ],
      "compactions": 0
    },
    {
      "shape": "streaming-balanced",
      "mode": "cursor-clear-16384",
      "wallMedianMs": 12.458,
      "maxRssBytesMedian": 73498624,
      "peakRssDeltaBytesMedian": 2998272,
      "retainedRssDeltaBytesMedian": 3637248,
      "retainedHeapDeltaBytesMedian": 1068720,
      "maxRssSamplesBytes": [
        73252864,
        74465280,
        73498624,
        74334208,
        72941568
      ],
      "peakRssDeltaSamplesBytes": [
        2981888,
        3047424,
        2998272,
        3129344,
        2736128
      ],
      "compactions": 0
    },
    {
      "shape": "streaming-balanced",
      "mode": "cursor-no-clear-4096",
      "wallMedianMs": 11.249,
      "maxRssBytesMedian": 72744960,
      "peakRssDeltaBytesMedian": 2916352,
      "retainedRssDeltaBytesMedian": 3457024,
      "retainedHeapDeltaBytesMedian": 1068272,
      "maxRssSamplesBytes": [
        73154560,
        72417280,
        73334784,
        72744960,
        72728576
      ],
      "peakRssDeltaSamplesBytes": [
        2932736,
        2785280,
        2850816,
        2916352,
        2916352
      ],
      "compactions": 0
    },
    {
      "shape": "streaming-balanced",
      "mode": "cursor-splice-4096",
      "wallMedianMs": 10.396,
      "maxRssBytesMedian": 73007104,
      "peakRssDeltaBytesMedian": 2932736,
      "retainedRssDeltaBytesMedian": 3670016,
      "retainedHeapDeltaBytesMedian": 1068080,
      "maxRssSamplesBytes": [
        73449472,
        72810496,
        73007104,
        72679424,
        73121792
      ],
      "peakRssDeltaSamplesBytes": [
        2981888,
        2932736,
        2834432,
        2867200,
        2932736
      ],
      "compactions": 0
    },
    {
      "shape": "streaming-balanced",
      "mode": "cursor-splice-16384",
      "wallMedianMs": 15.18,
      "maxRssBytesMedian": 72974336,
      "peakRssDeltaBytesMedian": 2965504,
      "retainedRssDeltaBytesMedian": 3473408,
      "retainedHeapDeltaBytesMedian": 1068248,
      "maxRssSamplesBytes": [
        72974336,
        72925184,
        73351168,
        73334784,
        72925184
      ],
      "peakRssDeltaSamplesBytes": [
        2998272,
        2965504,
        2834432,
        2850816,
        3063808
      ],
      "compactions": 0
    },
    {
      "shape": "streaming-balanced",
      "mode": "cursor-slice-4096",
      "wallMedianMs": 14.668,
      "maxRssBytesMedian": 73400320,
      "peakRssDeltaBytesMedian": 2965504,
      "retainedRssDeltaBytesMedian": 3604480,
      "retainedHeapDeltaBytesMedian": 1069208,
      "maxRssSamplesBytes": [
        74842112,
        72531968,
        73646080,
        73400320,
        73367552
      ],
      "peakRssDeltaSamplesBytes": [
        5406720,
        3063808,
        2916352,
        2965504,
        2883584
      ],
      "compactions": 0
    },
    {
      "shape": "streaming-balanced",
      "mode": "cursor-reset-4096",
      "wallMedianMs": 10.535,
      "maxRssBytesMedian": 72941568,
      "peakRssDeltaBytesMedian": 3014656,
      "retainedRssDeltaBytesMedian": 3489792,
      "retainedHeapDeltaBytesMedian": 1068896,
      "maxRssSamplesBytes": [
        72892416,
        72941568,
        72810496,
        73515008,
        73269248
      ],
      "peakRssDeltaSamplesBytes": [
        3031040,
        3014656,
        2719744,
        3031040,
        2916352
      ],
      "compactions": 0
    }
  ]
}