Speed Up Page Load by Preloading Critical CSS

CSS Analyzer

What is this warning?

One of your most important stylesheets is making your page load slowly because it's not being prioritized. You can tell the browser to fetch this file earlier by 'preloading' it. This simple change can make your page appear to load much faster, which is great for keeping visitors happy and improving your Core Web Vitals score.

How to Fix This Issue

How to Fix It

The Problem

A critical CSS file is loaded normally, which can block the page from rendering.

<link rel="stylesheet" href="/css/critical.css">

The Solution

Add `rel="preload"` and `as="style"` to the link. This tells the browser to start downloading the file immediately without waiting.

<link rel="preload" href="/css/critical.css" as="style" onload="this.onload=null;this.rel='stylesheet'">
<noscript><link rel="stylesheet" href="/css/critical.css"></noscript>

Why This Works

Preloading ensures that critical styling is available sooner, allowing the browser to render the visible part of the page much faster. This directly improves key performance metrics like First Contentful Paint (FCP). For more details, see Google's documentation on preloading critical assets.

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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