Publishing and Exporting Optimizing movies in general Use the following tips to optimize most Flash movies. Whenever possible, use tweened animations, which take up less file space than a series of keyframes.
Complexity can slow playback, even if the movie size is small.
Minimize your use of alpha transparency, gradients, masks, and tweens. Use symbols, animated or otherwise, for every element that appears more than once. Symbols are stored once in the file and may be referenced many times. Using symbols can significantly reduce the file size of your movie. Use Shared Libraries to contain media elements common to several loaded movies.