My animation runs hard :(

I am beginner! Please help me solve the problem! Out a site in flash cs4 and I faced a problem in creating symbols that contain animations in movieclip transparent. For example I have a layer formed an animation in a movieclip symbol in the first frame is 0% transparent effect and last frames are 80% transparent effect, so animation is in the gradual emergence of an object 0 in vision vision 80%. The problem is that under this layer I have 10 layers containing the same type of animation with objects that appear in the transparency opacity. This is going extremely difficult exported animation, I actually go jerky. Somebody knows how to optimize code or in another method so that can get a rolling animation fix