What is the expected functionality of "Update Program Performance Data"?

What is the expected functionality of "Update Program Performance Data", what we noticed is that the Costs (ITD Actual Costs/YTD Actual Costs) are getting refreshed in the "Analysis" tab of Program Management even before we run the above-mentioned Process or the Update Project Performance Data. As soon as we load cost, it gets updated in real-time basis. Is this the expected functionality? Also, we noticed that when we try to load cost via ADFDI there is a process "Update Project Performance Data Without Producing Report" runs automatically. Is this process causing the Costs to get updated even before we run