PageSpeed's 'Unused JavaScript' Warning Explained for Developers

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PageSpeed Insights flags JavaScript files downloaded but not executed during a page's initial load. This 'unused' label specifically refers to code that did not run in the tool's simulated first-visit scenario, not necessarily code that is safe to delete. Large, unused files can delay page loading on slow connections, as the browser must download them before rendering content. Developers are advised to prioritize removing truly unnecessary scripts, like a slider on a page without one, while preserving interactive elements like menus that load on user interaction.

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