2. What are Render-Blocking Resources?
When a website loads in the browser, it sends out calls to each and every script in a queue. That queue needs to be empty before the website is visible in the browsers. When the script queue is very long, it can take a while before visitors are able to access your site. Sometimes any of these scripts aren’t necessary for viewing the website right away, and could just as easily wait to run until after the site itself is fully loaded.
When referring to render-blocking resources, we’re usually talking about:
Once you’ve identified critical code, move that code from the render-blocking URL to an inline script tag on your HTML page. When the page loads, it will have what it needs to handle the page’s core functionality.
If there’s code in a render-blocking URL that’s not critical, you can keep it in the URL, and then mark the URL with async or defer attributes.
4. How to eliminate render-blocking stylesheets?
Similar to inlining code in a scrip tag, inline critical styles required for the first paint inside a style block at the head of the HTML page. Then load the rest of the styles asynchronously using the preload link (see Defer unused CSS).
Consider automating the process of extracting and inlining “Above the Fold” CSS using the Critical tool. Another approach to eliminating render-blocking styles is to split up those styles into different files, organized by a media query. Then add a media attribute to each stylesheet link.
This blog will help you to understand the concept of render-blocking resources and its importance in the speed optimization of the Magento 2 site. If any queries related to this blog or if you need Optimization Service then Contact Us.
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