Eliminate Render-Blocking CSS to Drastically Improve Page Speed

CSS Analyzer

What is this warning?

Your page is being slowed down by 'render-blocking' stylesheets. This means the browser has to stop everything and wait for your CSS files to download before it can show anything to the user. This delay is a major cause of slow-loading websites and can lead to visitors leaving before your page even loads.

How to Fix This Issue

How to Fix It

The Problem

Linking to large CSS files in the <head> of your HTML without any optimization.

The Solution

A common strategy is to identify the 'critical CSS'—the styles needed for the top part of your page—and include it directly in your HTML. Then, load the rest of the CSS in a non-blocking way.

<!-- 1. Put critical CSS directly in the head -->
<style>
  /* Minimum styles for above-the-fold content */
</style>

<!-- 2. Load the full stylesheet without blocking -->
<link rel="preload" href="full-styles.css" as="style" onload="this.onload=null;this.rel='stylesheet'">

Why This Works

This technique allows the browser to start rendering the page almost instantly, dramatically improving the perceived load time and your Core Web Vitals scores. Learn more from this web.dev article on render-blocking resources.

SEO Impact

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.

Automatic Detection

Black SEO Analyzer automatically checks for this warning during site analysis, along with hundreds of other technical SEO issues.

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