ipfw rules optimitsing

[Anatoliy]

Greetings to all.

I have a problem to optimise ipfw rules.
When I have started to search for the decision there were some questions
How it is possible to find out how many
loading gives this or that rule or all corrected as a whole.
 Prompt as it better to make in practice?
As it would be desirable to learn as dynamic pipes the quantity 
influences productivity,
how many calculations in a second occur thus etc.
if what or sysctl displaying expressly or by implication it is variables 
the information?

thnx, an sorry for bad English.