Lazy Load Checker

What is Lazy Loading?

Lazy loading is an optimization technique that defers the loading of non-critical resources at page load time. Instead, these resources are loaded only when they are needed—typically when they enter the viewport. This is primarily used for heavy assets like images, videos, and iframes.

• Performance: Reduces initial JS/CSS execution and network load.
• Bandwidth: Saves data for users who don't scroll to the bottom of the page.
• CWV: Significantly improves Largest Contentful Paint (LCP) and Total Blocking Time (TBT).

Why Lazy Loading is Critical for SEO

Google's Core Web Vitals heavily weight the speed at which a page becomes interactive. If your page tries to load 50 images simultaneously on launch, it will fail performance audits. Lazy loading ensures your server prioritizes the content the user sees first.

Modern web performance isn't just about loading everything fast; it's about loading the right things at the right time.

Best Practices for Resource Loading

Follow these rules to balance speed with user experience:

How to Use This Tool

Enter your URL and click "Analyze Resources". Our engine will crawl your page and identify every image and iframe, detecting whether they are using native lazy loading, a JavaScript library, or no optimization at all. You'll receive a detailed score and specific recommendations on which assets need to be deferred for better performance.