Many things to remember when optimizing the movie.
a) Image quality and Size (see tutorial maintian-image-quality)
(major way to reduce size is reduce image size not quality)
using huge effects (such as blur)
c) using buttons instead of sprites
d) creating instances of sprites when using it multiple times
e) frame per second for smoothness
f) using buttons' instances
g) using LoadMovie instead of embeding external movies
Using huge effects (such as blur)
Reduce Blur amount and scale factor
Use less frames if fulfill your movie needs
Create simple effects using transform, move effect