How Fluid compute works on Vercel

This post details how Vercel's Fluid compute model optimizes function execution through its router. It explains the real-time routing process, including Vercel Firewall inspection, edge caching checks, and compute selection based on in-flight and pre-warmed instances. It highlights the secure infrastructure design where instances communicate via persistent TCP tunnels to the router, enabling precise control over workload distribution and scaling. The post also quantifies cost savings, stating up to 85% reduction in compute costs.