Optimizing graphic elements and lines For Flash movies that contain groups, graphics, or lines that aren't converted to symbols, use these optimization tips. Limit the number of special line types such as dashed, dotted, ragged, and so on.
Solid lines require less memory.
Lines created with the Pencil tool require less memory than brush strokes. Group objects when appropriate. Grouping objects enables Flash to refer to one item instead of many individual ones. Use layers to separate elements that change over the course of the animation from those that do not. This can reduce the total number of keyframes.