The final size of a GIF animation file can be as high as the sums of each of the individual frames. This means if you had a file with five frames, each of which optimized to 20KB, your total GIF file could easily top 100KB! To reduce the file size, minimize the movement between each frame so the program doesn't have to redraw every aspect of every frame.
There are a few drawbacks to using GIF animation, the first of which is related to the fact that it is so commonly used for animation. So many users are accustomed to animations being used in banner ads on web sites that most say they don't even look at animation any more because they assume it's trying to sell something. Finally, GIF animation files can't contain sound or any interactivity.
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