Next.js Third-Party Scripts: Performance, Consent & Safe Loading | Endurance Softwares

Next.js 15's App Router changed how developers should think about script placement, and many teams are still using
outdated Pages Router patterns for third-party scripts. This guide clarifies the correct approach to next/script in the
App Router, including proper placement in root layout versus nested layouts, and how streaming and Suspense
interact with third-party script loading. It clears up common migration mistakes teams make when upgrading.
Screenshots and DevTools waterfall comparisons make the impact easy to explain to non-technical stakeholders..
Get the updated App Router script loading guide here:
https://www.endurancesoftwares.com/blog/nextjs-third-party-scripts-performance-guide-2026

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