When creating animated GIFs, its important to make sure that you get your files as small as possible. This means optimizing the images being used for the frames of the animation in such a way as to make the final animation file size extremely small. This begins with getting the bit-depth down as much as possible, but also cropping the frames so that only the changing areas are on the next frame. Below are two animations. One is optimized, and one is un-optimized. You can see how different the frames look after they have been optimized compared to the un-optimized animation.