During the loading screen, press the space bar a few times, when you have chosen "Earth" or "Start New Game". This will decrease the length of time you have to wait for the game to load.
Make Your Own Worlds
You need DPaint. Load the file 'CIVMAP.lbm into Dpaint and save it elsewhere. You can now draw your own world using the following color sequence:
Light Green = Grassland
Dark Green = Forest
Light Blue = Jungle
Medium Blue = River
Dark Blue = Oceans
Brown = Plains
Purple = Mountains
White = Artic
Yellow = Desert
Red = Hills
Grey = Tundra