In the web-design arena, what you don’t see can hurt you. Worse, it could damage your brand’s reputation, let alone hurt the bottom line. I’m talking about images, which can consume a lot of bandwidth, upwards of 70 percent in some sites. Viewing them incurs a cost on your and your visitors’ part. In fact, you’re probably charged for images that are not displayed because visitors don’t scroll down far enough to view them.
Blog posts of 'Preloading images' tag