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Vercel Flags SDK cuts cold-start initialization time by 7x in version 1.5.3

·2026.10.29 09:00

Key point

The update eliminates network waits during initialization and stops usage reporting from extending function duration.

Details

  • Vercel Flags SDK version 1.5.3 reduces p75 cold-start initialization time from over 70 ms to 10 ms, a 7x improvement.
  • The SDK now loads and parses the flags datafile immediately upon client creation and checks datafile revisions without network requests.
  • Usage reporting no longer uses waitUntil to keep functions running after the response is sent, preventing added function duration.
  • p99 flag-read latency remains under 1 ms across cold and warm invocations after initialization.
  • Users must update @flags-sdk/vercel to version 1.5.3 or later and redeploy their applications to receive these changes.
performancevercelsdkfeature-flagsserverlesscold-start
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