SPAs Are a Performance Dead End

Single Page Applications (SPAs) have become a performance bottleneck despite their original purpose of improving user experience. While SPAs were designed to solve problems with slow browsers and unreliable networks in the early 2000s, they now suffer from structural performance issues due to requiring multiple HTTP round-trips to assemble page fragments. This creates head-of-line blocking, waterfall request patterns, and complex client-side state management. Server-side rendering approaches, like Stack Overflow's sub-50ms HTML delivery using Razor, demonstrate superior performance and user experience by delivering complete pages in a single request and leveraging server-side caching. The architectural choice of SPAs fundamentally limits optimization potential, making it difficult for even major platforms like Facebook and LinkedIn to achieve fast page loads.