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CDN request collapsing

Vercel | In Edition 2, Saturday 27 Sep 2025

The call on this one

DEPLOYif you use ISR on Next.js

SOURCE Vercel, Preventing the stampede: Request collapsing in the Vercel CDN

The Vercel CDN now collapses over 3M requests per day on cache miss, on top of 90M collapsed requests from background revalidations, using node and regional distributed locks with three second timeouts.

Added to The Deploy Log Tuesday 15 Sep 2026, updated Thursday 17 Sep 2026. Read Edition 2, the edition that carried it.

8 rows from Vercel in The Deploy Log are dated on or before this one, this one included.

The same day from Vercel: External API queries (0 days apart). After it: uv Python builds, 7 days later.

Week of September 22, 2025 | September 2025

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