Five Techniques to Lazy Load Images for Website Performance - SitePoint
Briefly

Lazy loading images is a crucial web optimization strategy that enhances user experience by improving page load speeds and making content accessible faster, especially for image-heavy sites.
By deferring image loading until they’re needed—which is when they enter the browser's viewport—websites can ensure that users experience quicker load times and less frustration, potentially reducing bounce rates.
The practice of lazy loading allows for a more efficient use of bandwidth. This not only benefits users on slower connections but also reduces the strain on servers, as they handle fewer requests at once.
Implementing lazy loading can significantly impact the user experience, making it imperative for web developers to adopt this technique to improve overall site performance and visitor retention.
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