The fast index contains a link to almost every other page in our part of the Web. It is considerably faster to use than our main menu - no graphics, no helpful texts, no nifty bullets, just links. Most Web clients have some basic navigation tools built in. For example, most will maintain a history list of the pages you have visited, so that you can visit them again easily. Many also support bookmarks, so that if you find something interesting you can make your client remember it and go there again later, skipping all the intermediate steps that may have been needed to find it the first time.
Most Web clients have some way to switch off the automatic loading of graphic images.
If you have a slow modem, this will also save time. I strongly suggest you locate these tools in whatever Web client you are using - they will save you a LOT of time.