runtime-cache

To cache per-region data for serverless workloads on Vercel, you can use a runtime cache within Vercel Functions. This provides an ephemeral key-value store that survives deployments and isolates data across regions to reduce latency.

Tag-based invalidation in serverless caching allows you to invalidate groups of related keys efficiently. By assigning tags to cached entries, you can clear specific data clusters across environments instead of manually purging individual keys.

Yes, you can use a runtime cache with routing middleware and builds. It provides a framework-agnostic API surface via @vercel/functions, allowing fast and isolated caching across functions, middleware, and build processes.

Yes, Vercel runtime cache supports TTL, tags, and namespace customization. These features allow you to manage cache lifespans and organize isolated data stores effectively within your serverless applications.

To reduce cold-start costs for serverless applications using caching, implement a regional runtime cache. It stores ephemeral data per-region to improve latency and minimize the computational overhead of repeated initializations.

The limitation of ephemeral key-value stores in serverless environments is their temporary persistence. While data survives deployments and exists per-region, ephemeral caches are not permanent databases and require proper TTL and tag-based invalidation management.