Every now and then, I get a call from a client who is puzzled why their site is running slow. I would look at their page and see an innocuous image inserted into a paragraph. When I examine the image, though, I see that the client has artificially resized the image using HTML. One recent example showed on-screen as a 300px-wide image. When I examined it, it was actually 3000px wide (approx).

The script looks through some HTML markup and, based on the sizes in the image tags, resizes the images appropriately. An example and the source are provided.