Lazyloading may become standard browser feature
Google will be implementing a browser based lazyloading system in Chrome on some platforms. If this feature spreads to all browsers it will negate the need for individual websites to implement lazyloading.
https://developers.google.com/speed/pagespeed/service/LazyloadImages
More detailed analysis of the effects of lazyloading.
https://www.bleepingcomputer.com/news/google/google-chrome-to-feature-built-in-image-lazy-loading/