If PageSpeed Insights warns you to “eliminate render-blocking resources”, it means some CSS or JavaScript files stop the browser from showing your page until they download and process. Fixing this usually improves how fast content appears.
What is a render-blocking resource?
When a browser reads your HTML and finds a stylesheet or a normal script in the head, it generally pauses rendering until that file is loaded. Those files are render-blocking. CSS is blocking by default; scripts are blocking unless marked otherwise.
Why WordPress sites often have them
- Themes and plugins each load their own CSS and JS on every page.
- Page builders may load large global stylesheets and scripts.
- Third-party fonts and widgets add more requests.
How to fix it
1. Defer or async non-critical JavaScript
Adding defer lets HTML parse while scripts download and runs them afterward, in order. async runs scripts when ready, in any order. Many caching and performance plugins offer a delay or defer option; test carefully, since deferring can break some scripts.
2. Load scripts only where needed
Avoid loading slider, form or map scripts on pages that do not use them. Builders such as Tuli Builder load each element’s front-end script only on pages that use that element.
3. Inline critical CSS
Critical CSS is the minimum needed to render the above-the-fold area. Inlining it, and loading the rest asynchronously, helps content show faster. Performance plugins can generate it for you.
4. Remove unused CSS and JS
Disable plugins you do not need and avoid large frameworks you barely use.
5. Minify and combine wisely
Minify files to shrink them. Combining files matters less with modern HTTP/2 and HTTP/3.
6. Optimize fonts
Limit font families and weights, preload key fonts and use font-display: swap.
Test after every change
Deferring or delaying scripts can break menus, forms or sliders. Test key pages on desktop and mobile and re-run PageSpeed.
Related: speed up WordPress and Core Web Vitals.
Render-blocking resources FAQ
Are all render-blocking resources bad?
Critical CSS is needed to display the page. The goal is to reduce unnecessary blocking.
Will fixing this improve my ranking?
It helps page experience metrics like LCP, which support rankings and user satisfaction.