A JavaScript file is preventing your page from displaying until it has been fully downloaded and processed. This is a major cause of slow-loading websites, as it leaves your visitors staring at a blank screen. Fixing this is a critical step for improving your Core Web Vitals and overall user experience.
<script src="/js/app.js"></script>Add the `defer` attribute to the script tag. This allows the browser to continue building the page while the script downloads in the background.
<script src="/js/app.js" defer></script>Deferring scripts ensures that they don't block the critical rendering path. This leads to a much faster First Contentful Paint (FCP), which is a key metric for user-perceived performance.
This issue can affect your site's search engine rankings and user experience. Addressing it promptly helps ensure optimal performance and visibility in search results.
Black SEO Analyzer automatically checks for this warning during site analysis, along with hundreds of other technical SEO issues.
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