In order to increase the useability of the material, at the beginning of each section you will be given the option to preload the graphics needed for that section. While the preload process may take a few minutes, once the graphics have been downloaded into your cache, they will appear more quickly on the pages as you are going through the material. This will likely make your learning more pleasurable and less frustrating, especially if you use a modem to connect to the internet. Keep the graphics in your cache as long as you think you or others in your office will be using the material. But remember that a large cache can quickly fill a modest-sized hard drive, and you may need to empty it periodically.
All browsers have an option to clear the cache.
Each has its own advantages and disadvantages. Animated GIFs are not included on the Graphics Download pages, but once they are called up, they will reside in the cache for repeated viewings within a single session. However, this fomat does not offer pause and step controls for the animation. This format will work on all platforms. They will NOT preload to your internet cache, so this download time will occur each time you want to play the animation.