René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ulid() slow vs monotonic","articleBody":"Does it make sense that ulid() is so slow relative to monothonic?\nI ran this simple benchmark multiple times to test this library vs uuidv7,  and it always returns around the same results:\n\n```import { v7 as uuidv7 } from 'uuid';\nimport { ulid, monotonicFactory } from 'ulid';\n\nfunction bench(name, fn, N = 5_000_000) {\n  // warmup\n  for (let i = 0; i \u003c 200_000; i++) fn();\n  const t0 = performance.now();\n  for (let i = 0; i \u003c N; i++) fn();\n  const t1 = performance.now();\n  console.log(`${name}: ${(N / ((t1 - t0) / 1000)).toFixed(1)} ids/sec`);\n}\n\nbench('uuidv7', uuidv7);\nbench('ulid', ulid);\nbench('ulid(monotonic)', monotonicFactory());\n```\n\nThe results\n```\nuuidv7: 5486105.0 ids/sec\nulid: 31140.8 ids/sec\nulid(monotonic): 2054127.8 ids/sec\n```\n\nwhy is ulid() much slower than monotonic? and why is monotonic slower than uuidv7?","author":{"url":"https://github.com/atlanteh","@type":"Person","name":"atlanteh"},"datePublished":"2025-09-12T14:34:41.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/126/javascript/issues/126"}