lazy loading
Lazy loading is a technique that defers loading resources such as images, code or data until they are actually needed.
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Last mentioned Lazy loading postpones loading a resource until the moment it is needed, such as when an image scrolls into view, instead of loading everything when a program or web page starts. It reduces initial load time and the amount of data transferred.
Web browsers support lazy loading of images and iframes through the HTML loading attribute, and JavaScript applications often implement it by splitting code into chunks that load on demand. The opposite approach, loading everything up front, is called eager loading.
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