René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Performance degradation of Buffer allocation in NodeJS v24","articleBody":"### Version\n\nv24.13.0\n\n### Platform\n\n```text\nLinux ubuntu24 6.14.0-37-generic #37~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Nov 20 10:25:38 UTC 2 x86_64 x86_64 x86_64 GNU/Linux\n```\n\n### Subsystem\n\n_No response_\n\n### What steps will reproduce the bug?\n\n```\nconsole.log(process.version);\nlet table = [], count = 1e6;\nfor (let chunk_size of [10, 20, 50, 100, 200].map(v=>v*1024))\n{\n    let ts = Date.now();\n    for (let i = 0; i\u003ccount; i++)\n        Buffer.allocUnsafe(chunk_size);\n    let te = Date.now();\n    table.push({chunk_size, ms: te-ts});\n}\nconsole.table(table, ['chunk_size', 'ms']);\n```\n\n### How often does it reproduce? Is there a required condition?\n\nEvery time\n\n### What is the expected behavior? Why is that the expected behavior?\n\nBuffer allocation in NodeJS v24 should be same or better than in v20.\n\n### What do you see instead?\n\nDegradation depended on chunk size:\n```\nv20.12.1\n┌─────────┬────────────┬──────┐\n│ (index) │ chunk_size │ ms   │\n├─────────┼────────────┼──────┤\n│ 0       │ 10240      │ 1044 │\n│ 1       │ 20480      │ 1110 │\n│ 2       │ 51200      │ 1230 │\n│ 3       │ 102400     │ 1339 │\n│ 4       │ 204800     │ 1969 │\n└─────────┴────────────┴──────┘\n\n\nv24.13.0\n┌─────────┬────────────┬──────┐\n│ (index) │ chunk_size │ ms   │\n├─────────┼────────────┼──────┤\n│ 0       │ 10240      │ 996  │\n│ 1       │ 20480      │ 1223 │\n│ 2       │ 51200      │ 1387 │\n│ 3       │ 102400     │ 2077 │\n│ 4       │ 204800     │ 3349 │\n└─────────┴────────────┴──────┘\n```\n\n### Additional information\n\n_No response_","author":{"url":"https://github.com/damanis","@type":"Person","name":"damanis"},"datePublished":"2026-02-24T15:46:26Z","url":"https://github.com/nodejs/node/issues/61967"}