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Avoid excessive transparency and layers. Be careful when layering transparent objects on top of each other. The computer must calculate the color of each pixel as it plays. Large transparent movie clips can slow down your movie.
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Avoid full screen flash animation. The larger the screen area containing animation, the slower the animation will play back. Two separate animations, playing in opposite corners of the stage can have the same effect, even if they are small in size.
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Reduce the frame rate. Never set your flash movie higher than 18 frames per second. You should not need to go any faster than this. Then reduce the number of frames in tweens and the reduce the number of frames overall. An added benefit of slowing the frame rate down is that the entire animation use fewer total frames, thus reducing the overall file size.
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You may want to look at the _quality actionscript command in flash as well. You can toggle between high and low quality as the movie is playing. If you set it to "LOW" during the trouble spots the animation will play faster (but, images and text may appear a little rough). I never use it personally but it might be helpful in certain situations.
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Remember, some internet users may have slow computers. Following the tips above will help ensure that your movie performs the same everywhere.
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