CPP - Lazy loading of images
▻http://yoavweiss.github.io/ContentPerformancePolicy/#lazy-loading-of-images
“Images on the page that are outside of the initial viewport can often be downloaded and delay the page’s onload event without actually being seen by the user. That issue is significantly worse on mobile, where the viewports can be very long. A lazy loading directive can be used to indicate the browser that images outside of the first few images are all lazy loaded. The browser can then act on that directive and avoid loading those images.”