{
  "schema_version": "1.1",
  "id": "s4:https://vercel.com/changelog/vercel-flags-starts-7x-faster-and-no-longer-extends-function-duration",
  "slug": "vercel-flags-starts-7x-faster-and-no-longer-extends-function-duration-1t46aej",
  "url": "https://feed7.dev/p/vercel-flags-starts-7x-faster-and-no-longer-extends-function-duration-1t46aej",
  "title": "Vercel Flags starts 7x faster and no longer extends function duration",
  "why_included": "Vercel Flags 1.5.3 cuts internal-test p75 cold-start initialization from over 70 ms to 10 ms and stops usage reporting from extending function duration.",
  "summary": "The SDK now reads bundled flag data and checks its revision without a network request. In internal testing, p75 cold-start initialization fell from **over 70 ms to 10 ms**; p99 flag reads are **under 1 ms**. Usage reporting no longer keeps a function running after its response.",
  "practical_implication": "If you use Vercel Flags, update `@flags-sdk/vercel` to **1.5.3 or later** and redeploy to get the changes.",
  "agent_context": "The SDK now reads bundled flag data and checks its revision without a network request. In internal testing, p75 cold-start initialization fell from **over 70 ms to 10 ms**; p99 flag reads are **under 1 ms**. Usage reporting no longer keeps a function running after its response.\n\nIf you use Vercel Flags, update `@flags-sdk/vercel` to **1.5.3 or later** and redeploy to get the changes.\n\nThe initialization figures come from internal testing; the material does not give a workload or methodology for comparing them with other setups.",
  "source": {
    "name": "Vercel",
    "url": "https://vercel.com/changelog/vercel-flags-starts-7x-faster-and-no-longer-extends-function-duration",
    "published_at": "2026-10-29T06:00:00.000Z"
  },
  "source_class": "blog_post",
  "content_type": "Engineering Post",
  "layer": "infra",
  "domains": [
    "coding"
  ],
  "topics": [],
  "verification": {
    "status": "official_source",
    "label": "Official Source",
    "method": "source_feed",
    "verified_at": null
  },
  "uncertainty": [
    "The initialization figures come from internal testing; the material does not give a workload or methodology for comparing them with other setups."
  ],
  "connected_context": {
    "meaning": "This reports lower Flags initialization latency from bundled data and revision checks, plus usage reporting that no longer extends function duration. The p75 figures are internal; the source gives no workload or cross-setup comparison, so the gains are specific to the stated SDK behavior.",
    "corpus_size": 966,
    "generated_at": "2026-10-30T11:04:52.548Z",
    "connections": [
      {
        "title": "Flags SDK now evaluates flags 10x faster",
        "source_name": "Vercel",
        "source_url": "https://vercel.com/changelog/flags-sdk-now-evaluates-flags-10x-faster",
        "feed7_url": "https://feed7.dev/p/flags-sdk-now-evaluates-flags-10x-faster-0ja3slo",
        "reason": "Both report Flags SDK performance improvements, but this change targets initialization and function duration while the candidate targets batch evaluation overhead; the gains describe separate operations."
      },
      {
        "title": "Vercel Sandbox routing is now 18x faster globally",
        "source_name": "Vercel",
        "source_url": "https://vercel.com/changelog/vercel-sandbox-routing-is-now-18x-faster-globally",
        "feed7_url": "https://feed7.dev/p/vercel-sandbox-routing-is-now-18x-faster-globally-1xr4uw7",
        "reason": "Both are narrow latency improvements in Vercel infrastructure; this concerns SDK initialization and reporting, while the candidate concerns sandbox domain lookup, so neither establishes broader end-to-end speed."
      }
    ]
  },
  "lifecycle": "Current",
  "published_at": "2026-10-29T06:00:00.000Z",
  "modified_at": "2026-10-29T06:00:00.000Z",
  "supersedes": [],
  "expires_at": null,
  "formats": {
    "html": "https://feed7.dev/p/vercel-flags-starts-7x-faster-and-no-longer-extends-function-duration-1t46aej",
    "json": "https://feed7.dev/p/vercel-flags-starts-7x-faster-and-no-longer-extends-function-duration-1t46aej.json",
    "markdown": "https://feed7.dev/p/vercel-flags-starts-7x-faster-and-no-longer-extends-function-duration-1t46aej.md"
  }
}