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Lazy loading is critical not only for good performance, but also to deliver a good user experience. You can also use ImageKit’s website analyzer to identify if your website uses lazy loading or not, in addition other critical image-related optimizations on your page. The audit performed by this tool has a section dedicated for offscreen images. You can find out which images are a candidate for lazy loading and how many bytes you can save on the initial page load by using Google Lighthouse audit tool. We trigger the load for these images when they become visible. For images it usually translates to any image that is not visible to the user up front can be lazy loaded.Īs the user scrolls down the page, the image placeholders start coming into viewport (visible part of the webpage). The basic idea of lazy loading is simple - defer loading anything that is not needed right now. This will become more apparent as we explore lazy loading further. This reduction in bytes transferred from your delivery network reduces delivery costs. Thus, you reduce the total bytes delivered on the page., especially for users that bounce off the page or interact with only the top portion of the page. Image delivery, or delivery of any other asset, is usually charged on the basis of the number of bytes transferred.Īs mentioned earlier, with lazy loading, if the image is not visible, it never gets loaded. The second benefit for you is in terms of delivery costs. Hence, the page becomes usable much sooner as compared to one without lazy loading.
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Images not loading in firefox 40.0.3 download#
This ensures that the device is able to download and process the remaining resources much faster. Lesser resource requests mean lesser bytes to download and lesser competition for the limited network bandwidth available to the user. With lazy loading, you are reducing the number of images that need to be loaded on the page initially. This is the most important one for you as a website administrator - better performance and load time. If the user never scrolls, an image that is not visible to the user never gets loaded. An image, not visible to the user when the page loads, is loaded later when the user scrolls and the image actually becomes visible. Lazy Loading defers the loading of an image that is not needed on the page immediately. If an image is not needed up front, load it later when it actually needs to be viewed. For example, in a single page application, if a JS file is not needed until later, it is best not to load it initially. The technique of lazy loading can be applied to almost all the resources on a page. Instead of loading these resources as soon as the page loads, which is what normally happens, the loading of these resources is put off till the moment the user actually needs to view them. Similarly, lazy loading defers the loading of resources on the page till they are actually needed. The word “lazy” in the English language is often attributed to the act of avoiding work as long as possible. Here is a quick video to help you understand better: These techniques help in improving performance, better utilization of the device’s resources, and reducing associated costs. Lazy Loading Images is a set of techniques in web and application development that defer the loading of images on a page to a later point in time - when those images are actually needed, instead of loading them up front.