Web Development

What is Lazy Loading?

Lazy loading is a web performance technique that delays the loading of images and other non-critical resources until they're actually needed.

Definition

Lazy loading is a web performance technique that delays the loading of images, videos, and other non-critical resources until they are actually needed, specifically until they are about to enter the user's visible screen area. Rather than loading every image on a page simultaneously when it first loads, lazy loading prioritizes above-the-fold content and defers everything else. This reduces initial page load time, improves Core Web Vitals scores, and decreases unnecessary bandwidth usage.

Why It Matters for Small Businesses

Image-heavy pages, portfolios, product galleries, restaurant menus with photos, can be devastatingly slow without lazy loading. Visitors on mobile connections especially benefit from pages that load quickly because they do not wait to download images the user may never scroll to. WordPress has had native lazy loading built in since version 5.5.

Example

A photography studio portfolio page loads 60 high-resolution images simultaneously on page load, causing a 12-second load time. After implementing lazy loading, only the first few visible images load immediately, the rest load progressively as the user scrolls. Load time drops to under 2 seconds and Core Web Vitals scores improve dramatically.

Related Terms

Core Web VitalsLazy loading directly improves LCP and overall performance scores
Page SpeedOne of the most effective techniques for improving load time
Mobile-First DesignEspecially impactful for mobile users on slower connections

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