anonymous_github/backend/reports/replacement-path-optimization.json

{
  "measuredAt": "2026-11-03T19:56:40.313Z",
  "method": "Three fresh processes per version, alternating order; transform only, excludes compilation, I/O, child startup and fixture generation. Same-machine comparison against the Go implementation before regex optimization.",
  "comparison": [
    {
      "name": "2 MB CSV, 47 absent terms",
      "beforeMs": 1.646,
      "afterMs": 2.285,
      "speedup": 0.7203501094091903,
      "beforeAllocatedBytes": 288,
      "afterAllocatedBytes": 288,
      "sha256": "b3882940c0ad7a4f8e1385dcd3e32122c721f26b90144bb820b542e394f379cd"
    },
    {
      "name": "100 MB CSV, 47 absent terms",
      "beforeMs": 101.618,
      "afterMs": 118.113,
      "speedup": 0.8603456012462641,
      "beforeAllocatedBytes": 288,
      "afterAllocatedBytes": 288,
      "sha256": "fcccff214b1f6838f5d9345237f5252cd57e2263fc95640b2a3a5278156eec48"
    },
    {
      "name": "50 MB CSV, sparse matches",
      "beforeMs": 591.941,
      "afterMs": 269.905,
      "speedup": 2.1931457364628297,
      "beforeAllocatedBytes": 201666352,
      "afterAllocatedBytes": 100815288,
      "sha256": "153ce777c4473651a70f3f2f830cac5930214f6b998c08094939646193b0f9f0"
    },
    {
      "name": "22 MB text, 1.2 million replacements",
      "beforeMs": 394.294,
      "afterMs": 189.823,
      "speedup": 2.0771666236441315,
      "beforeAllocatedBytes": 114614896,
      "afterAllocatedBytes": 70813536,
      "sha256": "4e649aee83a6f15cb7178f725991ff5405affe013b0bba0b6eda18689c5c0249"
    }
  ],
  "samples": [
    {
      "run": 0,
      "implementation": "before",
      "allocatedBytes": 288,
      "compileMs": 27.398,
      "inputBytes": 1960000,
      "matchMs": 3.181,
      "name": "2 MB CSV, 47 absent terms",
      "outputBytes": 1960000,
      "runtime": "go1.27.3",
      "sha256": "b3882940c0ad7a4f8e1385dcd3e32122c721f26b90144bb820b542e394f379cd"
    },
    {
      "run": 0,
      "implementation": "before",
      "allocatedBytes": 288,
      "compileMs": 7.343,
      "inputBytes": 100800000,
      "matchMs": 101.618,
      "name": "100 MB CSV, 47 absent terms",
      "outputBytes": 100800000,
      "runtime": "go1.27.3",
      "sha256": "fcccff214b1f6838f5d9345237f5252cd57e2263fc95640b2a3a5278156eec48"
    },
    {
      "run": 0,
      "implementation": "before",
      "allocatedBytes": 201666352,
      "compileMs": 3.131,
      "inputBytes": 50400041,
      "matchMs": 591.941,
      "name": "50 MB CSV, sparse matches",
      "outputBytes": 50400014,
      "runtime": "go1.27.3",
      "sha256": "153ce777c4473651a70f3f2f830cac5930214f6b998c08094939646193b0f9f0"
    },
    {
      "run": 0,
      "implementation": "before",
      "allocatedBytes": 114620200,
      "compileMs": 3.847,
      "inputBytes": 21600000,
      "matchMs": 394.294,
      "name": "22 MB text, 1.2 million replacements",
      "outputBytes": 19800000,
      "runtime": "go1.27.3",
      "sha256": "4e649aee83a6f15cb7178f725991ff5405affe013b0bba0b6eda18689c5c0249"
    },
    {
      "run": 0,
      "implementation": "after",
      "allocatedBytes": 288,
      "compileMs": 7.654,
      "inputBytes": 1960000,
      "matchMs": 2.15,
      "name": "2 MB CSV, 47 absent terms",
      "outputBytes": 1960000,
      "runtime": "go1.27.3",
      "sha256": "b3882940c0ad7a4f8e1385dcd3e32122c721f26b90144bb820b542e394f379cd"
    },
    {
      "run": 0,
      "implementation": "after",
      "allocatedBytes": 288,
      "compileMs": 3.392,
      "inputBytes": 100800000,
      "matchMs": 64.824,
      "name": "100 MB CSV, 47 absent terms",
      "outputBytes": 100800000,
      "runtime": "go1.27.3",
      "sha256": "fcccff214b1f6838f5d9345237f5252cd57e2263fc95640b2a3a5278156eec48"
    },
    {
      "run": 0,
      "implementation": "after",
      "allocatedBytes": 100815272,
      "compileMs": 4.167,
      "inputBytes": 50400041,
      "matchMs": 269.905,
      "name": "50 MB CSV, sparse matches",
      "outputBytes": 50400014,
      "runtime": "go1.27.3",
      "sha256": "153ce777c4473651a70f3f2f830cac5930214f6b998c08094939646193b0f9f0"
    },
    {
      "run": 0,
      "implementation": "after",
      "allocatedBytes": 70813568,
      "compileMs": 9.856,
      "inputBytes": 21600000,
      "matchMs": 322.06,
      "name": "22 MB text, 1.2 million replacements",
      "outputBytes": 19800000,
      "runtime": "go1.27.3",
      "sha256": "4e649aee83a6f15cb7178f725991ff5405affe013b0bba0b6eda18689c5c0249"
    },
    {
      "run": 1,
      "implementation": "after",
      "allocatedBytes": 288,
      "compileMs": 7.513,
      "inputBytes": 1960000,
      "matchMs": 2.285,
      "name": "2 MB CSV, 47 absent terms",
      "outputBytes": 1960000,
      "runtime": "go1.27.3",
      "sha256": "b3882940c0ad7a4f8e1385dcd3e32122c721f26b90144bb820b542e394f379cd"
    },
    {
      "run": 1,
      "implementation": "after",
      "allocatedBytes": 288,
      "compileMs": 5.949,
      "inputBytes": 100800000,
      "matchMs": 153.087,
      "name": "100 MB CSV, 47 absent terms",
      "outputBytes": 100800000,
      "runtime": "go1.27.3",
      "sha256": "fcccff214b1f6838f5d9345237f5252cd57e2263fc95640b2a3a5278156eec48"
    },
    {
      "run": 1,
      "implementation": "after",
      "allocatedBytes": 100852328,
      "compileMs": 7.187,
      "inputBytes": 50400041,
      "matchMs": 329.242,
      "name": "50 MB CSV, sparse matches",
      "outputBytes": 50400014,
      "runtime": "go1.27.3",
      "sha256": "153ce777c4473651a70f3f2f830cac5930214f6b998c08094939646193b0f9f0"
    },
    {
      "run": 1,
      "implementation": "after",
      "allocatedBytes": 70813536,
      "compileMs": 4.706,
      "inputBytes": 21600000,
      "matchMs": 189.823,
      "name": "22 MB text, 1.2 million replacements",
      "outputBytes": 19800000,
      "runtime": "go1.27.3",
      "sha256": "4e649aee83a6f15cb7178f725991ff5405affe013b0bba0b6eda18689c5c0249"
    },
    {
      "run": 1,
      "implementation": "before",
      "allocatedBytes": 288,
      "compileMs": 4.075,
      "inputBytes": 1960000,
      "matchMs": 1.269,
      "name": "2 MB CSV, 47 absent terms",
      "outputBytes": 1960000,
      "runtime": "go1.27.3",
      "sha256": "b3882940c0ad7a4f8e1385dcd3e32122c721f26b90144bb820b542e394f379cd"
    },
    {
      "run": 1,
      "implementation": "before",
      "allocatedBytes": 288,
      "compileMs": 5.607,
      "inputBytes": 100800000,
      "matchMs": 119.659,
      "name": "100 MB CSV, 47 absent terms",
      "outputBytes": 100800000,
      "runtime": "go1.27.3",
      "sha256": "fcccff214b1f6838f5d9345237f5252cd57e2263fc95640b2a3a5278156eec48"
    },
    {
      "run": 1,
      "implementation": "before",
      "allocatedBytes": 201634616,
      "compileMs": 5.299,
      "inputBytes": 50400041,
      "matchMs": 624.138,
      "name": "50 MB CSV, sparse matches",
      "outputBytes": 50400014,
      "runtime": "go1.27.3",
      "sha256": "153ce777c4473651a70f3f2f830cac5930214f6b998c08094939646193b0f9f0"
    },
    {
      "run": 1,
      "implementation": "before",
      "allocatedBytes": 114614896,
      "compileMs": 3.318,
      "inputBytes": 21600000,
      "matchMs": 484.591,
      "name": "22 MB text, 1.2 million replacements",
      "outputBytes": 19800000,
      "runtime": "go1.27.3",
      "sha256": "4e649aee83a6f15cb7178f725991ff5405affe013b0bba0b6eda18689c5c0249"
    },
    {
      "run": 2,
      "implementation": "before",
      "allocatedBytes": 288,
      "compileMs": 6.028,
      "inputBytes": 1960000,
      "matchMs": 1.646,
      "name": "2 MB CSV, 47 absent terms",
      "outputBytes": 1960000,
      "runtime": "go1.27.3",
      "sha256": "b3882940c0ad7a4f8e1385dcd3e32122c721f26b90144bb820b542e394f379cd"
    },
    {
      "run": 2,
      "implementation": "before",
      "allocatedBytes": 272,
      "compileMs": 12.547,
      "inputBytes": 100800000,
      "matchMs": 100.802,
      "name": "100 MB CSV, 47 absent terms",
      "outputBytes": 100800000,
      "runtime": "go1.27.3",
      "sha256": "fcccff214b1f6838f5d9345237f5252cd57e2263fc95640b2a3a5278156eec48"
    },
    {
      "run": 2,
      "implementation": "before",
      "allocatedBytes": 201666400,
      "compileMs": 3.38,
      "inputBytes": 50400041,
      "matchMs": 589.404,
      "name": "50 MB CSV, sparse matches",
      "outputBytes": 50400014,
      "runtime": "go1.27.3",
      "sha256": "153ce777c4473651a70f3f2f830cac5930214f6b998c08094939646193b0f9f0"
    },
    {
      "run": 2,
      "implementation": "before",
      "allocatedBytes": 114614880,
      "compileMs": 3.723,
      "inputBytes": 21600000,
      "matchMs": 358.638,
      "name": "22 MB text, 1.2 million replacements",
      "outputBytes": 19800000,
      "runtime": "go1.27.3",
      "sha256": "4e649aee83a6f15cb7178f725991ff5405affe013b0bba0b6eda18689c5c0249"
    },
    {
      "run": 2,
      "implementation": "after",
      "allocatedBytes": 288,
      "compileMs": 7.414,
      "inputBytes": 1960000,
      "matchMs": 2.286,
      "name": "2 MB CSV, 47 absent terms",
      "outputBytes": 1960000,
      "runtime": "go1.27.3",
      "sha256": "b3882940c0ad7a4f8e1385dcd3e32122c721f26b90144bb820b542e394f379cd"
    },
    {
      "run": 2,
      "implementation": "after",
      "allocatedBytes": 272,
      "compileMs": 5.508,
      "inputBytes": 100800000,
      "matchMs": 118.113,
      "name": "100 MB CSV, 47 absent terms",
      "outputBytes": 100800000,
      "runtime": "go1.27.3",
      "sha256": "fcccff214b1f6838f5d9345237f5252cd57e2263fc95640b2a3a5278156eec48"
    },
    {
      "run": 2,
      "implementation": "after",
      "allocatedBytes": 100815288,
      "compileMs": 3.414,
      "inputBytes": 50400041,
      "matchMs": 247.259,
      "name": "50 MB CSV, sparse matches",
      "outputBytes": 50400014,
      "runtime": "go1.27.3",
      "sha256": "153ce777c4473651a70f3f2f830cac5930214f6b998c08094939646193b0f9f0"
    },
    {
      "run": 2,
      "implementation": "after",
      "allocatedBytes": 70813536,
      "compileMs": 3.909,
      "inputBytes": 21600000,
      "matchMs": 162.45,
      "name": "22 MB text, 1.2 million replacements",
      "outputBytes": 19800000,
      "runtime": "go1.27.3",
      "sha256": "4e649aee83a6f15cb7178f725991ff5405affe013b0bba0b6eda18689c5c0249"
    }
  ]
}