As an aside, I truly dislike lazy loading. If it's really that important to perceived page speed, isn't it something that the browsers should be implementing, rather than everyone and his brother breaking HTML and require full JavaScript execution in order to display images?
I'm not excited about it. I can't remember a single time a page with lazy-loaded images felt snappier. It seems very dependent on latency to the host serving the images. Most pages also don't account for content shifting when images haven't loaded yet.
