A/B Testing and Feature Flags with sub-millisecond performance

What this post added

Introduces Vercel Edge Config, a globally distributed, ultra-low latency data store for configuration data, optimized for fast reads and infrequent writes. This enables dynamic data storage alongside functions, with data replicated to all Vercel regions for instant availability. It allows for near-zero latency experimentation (0ms to 10ms lookups) and dynamic changes without new deployments. Integrates with experimentation tools like LaunchDarkly, Statsig, and Split. Also details dynamic routing with Edge Middleware using Edge Config for blocking IPs/user-agents and advanced security rules.