Secondary pages don't always need graphics, though smaller pictures and images do add to the visual appeal of the page.
Graphic files tend to be rather large, even with the advanced compression techniques used today.
The Page Size section provides caution and guidance for limiting the total combined sizes of page text and graphic files. Then a link can be provided to access the full size version, and the file size should be indicated so the user can decide whether or not to wait for the image to download. The way a page and its graphics are downloaded, is the file containing the text content of the page and the code for the layout of the page, is sent to the browser. Previously, the browser waited until the image file was received before it displayed the page on the monitor. The reason for delaying the display was because the browser had to receive information concerning the physical size of the images to correctly display the page.