# Vercel — How we cut CDN metadata lookup latency by 91%

- Company: Vercel (vercel.com)
- Announced: 2026-09-10
- Category: infrastructure-release
- Coverage: not counted
- Announcement: no
- Group: routine
- Source: https://vercel.com/blog/how-we-cut-cdn-metadata-lookup-latency-by-91-percent
- Record: https://forck.live/items/20660-how-we-cut-cdn-metadata-lookup-latency-by-91
- Subject: v0 / AI SDK / AI Gateway

Vercel redesigned its CDN metadata lookup by grouping path metadata into indexed shards of about 200 KB, reducing P99 latency from 215.8 ms to 19.1 ms (91% lower) and average latency from 8.59 ms to 1.81 ms (79% lower) on production traffic measured August 5–12, 2026.

## Evidence

Verbatim from https://vercel.com/blog/how-we-cut-cdn-metadata-lookup-latency-by-91-percent:

> Production measurements showed lower average and P99 lookup latency: ... P99 latency 215.8 ms before, 19.1 ms after, 91% lower

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