How Vercel Reinvented Serverless with Fluid Compute: Breaking Lambda's Bottlenecks to Slash Costs by 95%
Vercel's Fluid compute shatters AWS Lambda's one-request-per-instance model through a custom TCP transport layer and request multiplexing, enabling streaming responses and dramatic cost reductions. By intelligently routing traffic and introducing Active CPU pricing, they've transformed serverless economics for I/O-bound workloads like AI. This deep dive reveals the 2-year engineering journey behind architecture handling 45B weekly requests.