{ "schemaVersion": 1, "generatedAt": "2026-08-22T03:16:26.552Z", "subject": "Empty Node.js child process launch latency", "unit": "milliseconds", "lowerIsBetter": true, "samplesPerImplementation": 100, "warmupsPerImplementation": 20, "source": { "package": "node-cmd@6.0.0", "runtimeFiles": { "cmd.js": "84cd6477e8ef40b8faa83da6b3de1ddb376cb19712a2af43e80f3d9762be5081", "cmd.mjs": "14c30bd1cdb5b715bb097dda1a37866baae86bf3754e06a8b1d1ecc55ba5ca62" }, "benchmarkFiles": { "benchmark/run.js": "1317c223ca771dc4781c87abbe408a8c3ccf90d69ad85096c7f1a05b3755e103", "benchmark/render-chart.js": "7e3d0d96ee55f73e03e915a6675c0086528f376a1afa4fe66fa906cc6780f871" } }, "environment": { "node": "v22.12.0", "v8": "12.4.254.21-node.21", "platform": "win32", "release": "10.0.26200", "arch": "x64", "cpu": "Intel(R) Core(TM) Ultra 9 275HX", "logicalCpuCount": 24 }, "methodology": { "child": "The current Node executable starts with an empty -e program.", "processShapes": "run* starts the platform shell plus the empty Node child; runFile* and runStream start the empty Node child directly.", "pairing": "Node direct and node-cmd launches run sequentially; first position alternates each sample.", "interpretation": "node-cmd delegates to node:child_process. Differences near scheduler variation are not evidence that either wrapper makes the operating system launch a process faster." }, "results": [ { "id": "run-callback", "label": "run ยท callback", "nodeApi": "exec", "nodeCmdApi": "run", "direct": { "minMs": 48.934, "p25Ms": 51.572, "p50Ms": 53.04, "p75Ms": 54.892, "p95Ms": 62.407, "maxMs": 103.085, "averageMs": 55.028, "medianAbsoluteDeviationMs": 1.629, "standardDeviationMs": 8.694 }, "nodeCmd": { "minMs": 48.404, "p25Ms": 51.6, "p50Ms": 52.859, "p75Ms": 54.763, "p95Ms": 65.233, "maxMs": 103.02, "averageMs": 55.379, "medianAbsoluteDeviationMs": 1.468, "standardDeviationMs": 9.647 }, "pairedDelta": { "minMs": -48.252, "p25Ms": -2.016, "p50Ms": -0.184, "p75Ms": 1.345, "p95Ms": 9.405, "maxMs": 47.811, "averageMs": 0.35, "medianAbsoluteDeviationMs": 1.706, "standardDeviationMs": 12.787, "p50Percent": -0.346, "medianCi95Ms": [ -0.716, 0.235 ] }, "samples": [ { "pair": 1, "order": [ "node:child_process", "node-cmd" ], "directMs": 56.306, "nodeCmdMs": 54.153, "deltaMs": -2.154 }, { "pair": 2, "order": [ "node-cmd", "node:child_process" ], "directMs": 60.695, "nodeCmdMs": 58.162, "deltaMs": -2.533 }, { "pair": 3, "order": [ "node:child_process", "node-cmd" ], "directMs": 56.464, "nodeCmdMs": 59.273, "deltaMs": 2.808 }, { "pair": 4, "order": [ "node-cmd", "node:child_process" ], "directMs": 58.217, "nodeCmdMs": 54.974, "deltaMs": -3.242 }, { "pair": 5, "order": [ "node:child_process", "node-cmd" ], "directMs": 57.614, "nodeCmdMs": 61.363, "deltaMs": 3.75 }, { "pair": 6, "order": [ "node-cmd", "node:child_process" ], "directMs": 61.444, "nodeCmdMs": 65.233, "deltaMs": 3.788 }, { "pair": 7, "order": [ "node:child_process", "node-cmd" ], "directMs": 64.56, "nodeCmdMs": 54.864, "deltaMs": -9.696 }, { "pair": 8, "order": [ "node-cmd", "node:child_process" ], "directMs": 55.883, "nodeCmdMs": 68.521, "deltaMs": 12.638 }, { "pair": 9, "order": [ "node:child_process", "node-cmd" ], "directMs": 56.116, "nodeCmdMs": 54.398, "deltaMs": -1.718 }, { "pair": 10, "order": [ "node-cmd", "node:child_process" ], "directMs": 50.751, "nodeCmdMs": 53.07, "deltaMs": 2.319 }, { "pair": 11, "order": [ "node:child_process", "node-cmd" ], "directMs": 51.933, "nodeCmdMs": 54.59, "deltaMs": 2.657 }, { "pair": 12, "order": [ "node-cmd", "node:child_process" ], "directMs": 51.147, "nodeCmdMs": 98.959, "deltaMs": 47.811 }, { "pair": 13, "order": [ "node:child_process", "node-cmd" ], "directMs": 51.056, "nodeCmdMs": 51.666, "deltaMs": 0.61 }, { "pair": 14, "order": [ "node-cmd", "node:child_process" ], "directMs": 48.934, "nodeCmdMs": 50.043, "deltaMs": 1.109 }, { "pair": 15, "order": [ "node:child_process", "node-cmd" ], "directMs": 52.313, "nodeCmdMs": 50.146, "deltaMs": -2.167 }, { "pair": 16, "order": [ "node-cmd", "node:child_process" ], "directMs": 51.41, "nodeCmdMs": 51.229, "deltaMs": -0.181 }, { "pair": 17, "order": [ "node:child_process", "node-cmd" ], "directMs": 51.127, "nodeCmdMs": 50.766, "deltaMs": -0.362 }, { 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