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How to eliminate render-blocking resources — CSS and JavaScript
- Render-blocking resources, including CSS stylesheets and JavaScript files, hinder the initial page load and can be eliminated by inlining critical CSS, deferring non-critical CSS and scripts, lazy loading, splitting JS bundles, caching or self-hosting third-party scripts, and removing unused styles and code.
- Identifying and eliminating render-blocking resources is crucial for improving page speed, SEO, and Google's Core Web Vitals performance metrics like First Contentful Paint (FCP) and Largest Contentful Paint (LCP).
- Tools like Lighthouse, PageSpeed Insights, and GTmetrix help in analyzing and identifying render-blocking resources, offering suggestions to improve site performance.
- To optimize CSS delivery, critical CSS should be inlined, non-critical CSS deferred, and unused CSS removed. Chrome DevTools' Coverage tab can help visualize critical and non-critical CSS and JS.
- For JavaScript delivery optimization, using defer or async attributes in