In the world of web design, what you don’t see can hurt you. Worse, it can damage your brand reputation, bottom line, or both.
Specifically I’m talking about images. Images can consume a lot of bandwidth (upwards of 70% of it for some sites). You get charged to send them. Your users are are charged to view them. In fact, you’re both probably getting charged for images that are never seen because website visitors never scroll down far enough to view them.