Triangles that involved in specific sequence

Hi there,

How to know how many Triangles are involved in specific sequence?

While creating animations (Effects : Flash), some sequence works out fine with 25~30 FPS.

But some with significant FPS drop from 30  to 5, resulting No perceptible animation.

My guess is that just too many triangles involved in the sequence.

So it comes to how to know the quantity of triangles invloved?

Any reply is appreciated.

Regards,

ClarK