Now, many sites are full of graphics in various forms: avatar images, illustrations to the posts, galleries, etc.
The readers of the blog “client optimization” as anyone else know the price of extra requests to the server.
The number of requests to the server can be easily reduced using the technique of fast loading images, which do not fall within the scope of (the first screen). That is, first of all only those images that the user will be able to see will be loaded, the rest will be loaded when scrolling the page.
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