Code Splitting & Bundle Optimization #1028
Description
Production bundle analysis reveals critical performance issues: Pages Router (Builder.io marketing pages) ships 2.24 MB of JavaScript per page with the _app chunk alone weighing 1.98 MB, while App Router (docs/guides) performs reasonably at 183-414 KB. The 12x size difference between routing systems indicates poor code splitting, with Builder.io integration, duplicate dependencies (date-fns/dayjs), and eagerly loaded third-parties causing massive bundle bloat. Implementing strategic optimizations through dynamic imports, vendor chunk splitting, and route-based code splitting could reduce marketing page bundles by 60-70% and significantly improve Core Web Vitals scores.