Add Responsive Images to LCP Element for Better Performance

Web Vitals Analyzer

What is this warning?

The image that serves as your page's Largest Contentful Paint (LCP) element is not responsive, meaning users may be downloading unnecessarily large images. Since this is the most critical visual element, optimizing it is essential for Core Web Vitals.

How to Fix This Issue

How to Fix It

The Problem

<img src="hero-large.jpg" alt="Hero image">

The Solution

Provide multiple sizes for the LCP image using srcset.

<img src="hero-large.jpg" 
     srcset="hero-small.jpg 480w, hero-medium.jpg 800w, hero-large.jpg 1200w" 
     sizes="100vw" 
     alt="Hero image">

Why This Works

Responsive LCP images ensure users download appropriately sized images, significantly improving LCP times especially on mobile devices.

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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