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Lozad.js is a lightweight JavaScript library for efficient lazy loading of images and other media, improving page load times.

LazySizes is a lightweight, feature-rich JavaScript library used for lazy loading images, iframes, scripts, and other resources. It intelligently loads content only when it's about to enter the viewport, significantly improving page load times and reducing bandwidth usage. LazySizes is highly configurable and works without any dependencies, making it an excellent choice for optimizing web performance.

Instant.Page is a lightweight JavaScript library that uses just-in-time preloading to make website navigation faster.

InstantClick is a JavaScript library that preloads pages on hover, making website navigation feel instantaneous.

Intersection Observer is a browser API that efficiently detects when an element enters or leaves the viewport, useful for implementing lazy loading and infinite scrolling.