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Flash's default frame rate is 12 frames per second (fps) and generally produces the best results for the web. If the frame rate is too fast it will blur the details of the animation and become CPU intensive which could result in the deterioration of the overall movie (a higher rate will not effect the size of your file/movie). A frame rate that is too slow will have a similar effect where it appears to stop and start. QuickTime and AVI movies are generally 12 fps, while video uses 24 frames per second. The human brain will see the individual frames of an animation if it's below 24 fps. At 24 fps the brain can no longer keep up and is tricked into seeing an animation like it was someone walking down the street (no bumps). Which is why motion-pictures screen at 24 fps.
Note: There is an exception to this rule. If you are performing calcuations and not requiring any animations bump up the frame rate to 120 (the max speed you can have in flash 4). If you keep your movie at 24 fps your 'go to and play' loops will take 1/24 of a second to complete. Now consider if your movie contain numerous loops, at 120 fps the speed saving is very big! This also raise the question of flash movie architecture. Should one keep heavy calculations in a separate movie to your animation?
Notes: For standalone Flash files and some hi-action movies like games. You may feel the need to push past 24 fps. This is up to you however be wary of the consideration mentioned later in this tutorial.
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Figuring Frame Rates
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