How does performance profiling data complement ADDI discovery findings during the Optimize phase?

Think of it like working hands-on with IBM mainframe systems — the answer here is 'Performance profiling replaces ADDI dependency graphs because it provides more accurate call chain data'. CPU profiling data from z/OS SMF or RMF records identifies the highest-cost COBOL programs, letting teams prioritize optimization work on programs where efficiency gains will have the greatest busines. On real mainframe exams, this concept comes up repeatedly so make sure you have it locked in.