It's time to lazy-load offscreen iframes! | Articles | web.dev
Lazy-loading of <iframe> elements defers offscreen iframes from being loaded until the user scrolls near them. This saves data, speeds up the loading of other parts of the page, and reduces memory usage. As with lazy-loading for images, use the loading attribute to tell the browser you want to lazy-load an iframe. <iframe src="https://example.com" loading="lazy" width="600" height="400"></iframe>
content-visibility: the new CSS property that boosts your rendering performance | Articles | web.dev
The content-visibility property, launching in Chromium 85, might be one of the most impactful new CSS properties for improving page load performance. content-visibility enables the user agent to skip an element's rendering work, including layout and painting, until it is needed. Because rendering is skipped, if a large portion of your content is off-screen, leveraging the content-visibility proper
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Optimizing CSS for faster page loads
