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With increasingly heavy and complex websites, protocols such as lazy loading are a gift from the sky – they allow sites to download only images and iframes that the user sees, leaving out those who are out of sight. This has been possible for years thanks to JavaScript libraries, but native implementations should always be preferred because they are the ones that consume the least amount of resources. That's exactly what the Chrome team has been working on since last year, with the first clues in February and a test on Canary that began in August. Google has announced that it will turn it on by default from stable Chrome 75 in May.
The feature works exactly as you would like. Images and iframes under the fold of a page will only be loaded if the user scrolls them nearby, the exact timing of loading depending on factors such as network speed. Most of the time, images and iframes must be loaded in advance and users should not even notice the underlying mechanisms.
Web site developers can adjust the behavior of images and iframes with loading attribute, putting them to lazy, desirous, and car – with desirous essentially disable delayed loading for the corresponding articles.
While lazy loading was initially supposed to accelerate mobile web browsing on Android, it is now supported on all major platforms for using Google's Blink rendering engine: Windows, Mac, Linux , Chrome OS, Android and Android WebView. Plus, when you use Chrome's Data Saver on Android, the feature will be even more aggressive: items with loading = "auto" or undefined attributes will always be downloaded only when needed.
This could have consequences for advertising: some iframes count impressions when they are loaded, not when the user reads them. They may end up with smaller numbers. However, website owners can still set their ads on loading = "eager", neutralizing the purpose of Chrome's new feature, but allowing them to make money.
Overall, it is a welcome change. We desperately need all the improvements to accelerate the use of Chrome and reduce its resources. According to tests conducted in 2018, a lazy load, in particular, could help speed up web browsing by 18 to 35 percent.
You've already been able to use this feature for quite some time now: Go to chrome: // flags and search lazy. You must enable both indicators that you find and restart the browser. I tested it myself, but I did not notice any substantial change in the way websites were represented – which is a good sign because everything is supposed to unfold off-screen.
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