Example of "lazy loading": placeholders are filled with images

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You might realize that there is an element that is not needed for the fastest display, but is blocking rendering. Its loading can be deferred, thus speeding up the interactivity of the first screen. For asynchronous loading, use the appropriate attributes of the "script" tag : async and defer.

Sometimes it is worth loading images asynchronously, especially if there are a lot of them on the page. Use lazy loading technique and make sure to specify adaptive sizes for placeholders (clearly defined places in the layout where elements will be loaded). The "lazy loading" technique will help the browser read HTML pages faster, and placeholders will eliminate the risk of layout shifts.

Example of "lazy loading": placeholders are filled with images as soon as the user scrolls russia rcs data down the page

as soon as the user scrolls down the page

Layout offset
Cumulative Layout Shift (CLS) measures the extent of the impact of layout shifts. Sometimes you’re on a page and you’re reading text or browsing content in general, and suddenly everything shifts down because of a pop-up ad or a loaded image. This is a page layout shift, and how much of the screen is shifted is a measure of CLS (“cumulative layout shift”).

Images, videos, fonts, and advertisements that are not specified to a specific size or that dynamically change their location cause layout shifting.