Use URLs which are meaningful and exclusively lower case - this helps people who have to type them in. Avoid dead ends - plan that any page could be the first page for users reaching the site from a search engine. Any changes to the default link colours and style make it more difficult for users to find the links. Give sizes of files that can be downloaded. The wording of links embedded in text should help users scan the contents of a page, and give prominence to links to key pages.
Graphics add interest but are slow to load and can impede navigation.
Reduce the size of graphics by selecting the file type which will give the smallest image after compression. In the case of GIF images try to reduce the number of colours used. Give the dimensions of the images in the 'IMG SRC' tags of the HTML as the browser can then format the page before loading the graphics, rather than having to reformat each time an image is loaded. Use the ALT tag to describe graphics, as many users do not wait for graphics to load. Make text easy to read and use Avoid the use of flashing or animation, as users find this very distracting.