I've been using this in a script I wrote for myself which is basically a huge image gallery. This gallery may consist of thousands of images on a single page. W

I've been using this in a script I wrote for myself which is basically a huge image gallery. This gallery may consist of thousands of images on a single page. When the browser always had to load all of those thumbnails, it consumed a lot of bandwidth and was very slow. In fact, the user experience was strictly worse because images are normally loaded in the order they appear on the website, so it took several seconds until the thumbnails at the end of the page were available. Now the browser just loads those thumbnails that I can see (or am about to see), and they are there pretty much instantly even if I scroll to the end of my gallery.