Fluid compute is a new model for web application infrastructure that optimizes performance and cost. It eliminates the need for over-provisioning and scaling challenges, providing auto-scaling and pay-as-you-go pricing while minimizing cold starts and inefficient use of idle time. Fluid compute uses mini-servers to achieve high-performance execution and reduces compute costs by up to 85%. The model triggers only when needed, supports real-time scaling from zero to peak traffic, and bills based on actual compute usage. It also prioritizes existing resources before creating new instances, eliminating hard scaling limits and leveraging warm compute for faster, more efficient scaling. Additionally, Fluid minimizes cold starts by reducing their frequency and softening their impact, and supports advanced tasks like streaming and post-response processing without requiring zero configuration or maintenance overhead.