Which of these changes to a Security Policy optimizes Security Gate way performance?

Which of these changes to a Security Policy optimizes Security Gate way performance?

A.
Using domain objects in rules When possible

B.
Using groups within groups in the manual NAT Rule Base

C.
Pulling the leastused rule at the top of the Rule Base

D.
Logging rules as much as possible

E.
Removing old or unused Security Policies from Policy Packages