# How we cut CDN metadata lookup latency by 91%

Publisher-attributed story with a reviewed brief or permitted publisher paragraph. The original publisher is responsible for the linked reporting.

- Publisher: Vercel
- Author credit: Tim Caswell; Steven Salat; Luba Kravchenko
- Category: Cloud
- Original publication time: 2026-09-10T00:00:00Z
- Original update time: 2026-09-10T00:00:00Z
- First observed by NexusTechWire: 2026-10-01T20:28:47Z
- Original source: https://vercel.com/blog/how-we-cut-cdn-metadata-lookup-latency-by-91-percent
- NexusTechWire record: https://nexustechwire.com/news/news-7ba7ffd70c507f2338d5

## The brief

Vercel reported on September 10 that grouping CDN routing metadata into indexed files cut its measured 99th-percentile lookup time from 215.8 to 19.1 milliseconds. The roughly 200 KB groups warm multiple paths in one fetch while parsing only the requested record. These are Vercel's production measurements from August 5–12; deployments built after July 17 already use the format, while older ones need redeployment.

AI-assisted NexusTechWire summary, checked against the linked source on 2026-10-02T03:56:09Z. Not independent reporting.

Read the full original: [Vercel](https://vercel.com/blog/how-we-cut-cdn-metadata-lookup-latency-by-91-percent)

This record does not reproduce the complete article or represent independent confirmation of every source claim.