This blog post is a must-read. The “Achilles’ heel” of caching is that upon invalidation, origins can get “dogpiled”. ISR addresses this lethal gap out of the box. Even on completely cold deployments and regions. It keeps you online *and* saves you money.
When CDN caches expire, traffic spikes can trigger a stampede of function invocations to revalidate. Vercel now collapses these spikes into single regenerations for ISR and image optimization. Already collapsing 3M+ requests per day. vercel.com/blog/cdn-reque…