JavaScript Lazy Loading Images: A Practical Guide

Lazy loading images — deferring offscreen image loads until they're about to enter the viewport — meaningfully improves initial page load performance, particularly for image-heavy pages.

The native `loading="lazy"` HTML attribute now handles most basic cases without any JavaScript at all, with broad browser support. For more control — custom loading thresholds, placeholder blur effects — the Intersection Observer API provides an efficient, modern approach without the performance cost of older scroll-event-based implementations.

Cantonet Technologies implements image loading strategies appropriate to each project's actual performance requirements and browser support needs.