![]() ![]() In other words, if the user doesn’t scroll to an image, it’s never loaded.Īs a bonus, lazy loading with properly sized placeholders can improve your site's perceived performance and Cumulative Layout Shift. Non-critical images (offscreen) are loaded slightly before the visitor needs them. When applied correctly, this technique makes sure that:Ĭritical images (above the fold) are loaded instantly Without a person seeing it, requesting and processing any image is unnecessary. In fact, they often contribute the most to page size, compared to other elements like CSS and JavaScript files.Īccording to the Web Almanac 2021, images remain the largest resource that contributes the most to the constantly growing page weight indicator:Īt the same time, visitors don’t need images they aren’t currently looking at. This is a problem, as images files tend to be heavy. Well, by default, before browsers start rendering, they request all images on the page, even those that aren’t immediately visible. Deferring them makes sure they’re loaded after other, more critical resources. Offscreen images aren’t visible before the user navigates to them. Lazy loading offscreen images refers to using a set of techniques to load only the images that visitors are currently looking at. On the other hand, if you just want an easy way to lazy load all images, including background ones, skip to the end. The three ways to manually fix the “Defer offscreen images” warning. Unfortunately, doing that is still more complicated than it can be.Īt the same time, you shouldn’t ignore this opportunity, as lazy loading can immensely improve your website’s performance. For an easy way to lazy load all images without worrying about the technicalities, check out NitroPack.Ī common suggestion in Google’s PageSpeed Insights (PSI) is to “Defer offscreen images”. Unfortunately, setting it up requires lots of time and coding skills. TL DR: Lazy loading images can massively improve your website’s actual and perceived performance. ![]()
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