In 2024, the median Next.js application ships 1.2MB of uncompressed JavaScript to the client on first load. For 73% of these apps, code splitting with React Suspense could reduce that payload by 40-65% without sacrificing user experience. This guide walks you through implementing production-grade code splitting in Next.js 15 with React 19’s enhanced Suspense primitives, complete with benchmark-validated results and full runnable code.

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