Why Streaming is Mandatory for AI UX
Large language models take 2–10 seconds to generate complete responses. Waiting for full completion results in high perceived latency. HTTP streaming (Server-Sent Events) pushes tokens incrementally as they are sampled, cutting Time to First Token (TTFT) to under 200ms.
Edge Function Constraints
Edge runtimes (Cloudflare Workers, V8 isolates) boot in < 5ms without cold starts, but have strict memory caps (128MB) and lack native Node.js C++ bindings. Architect forward deployments to offload heavy workloads to serverless container workers.