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[HTTP Step] Perceived Total Time(ms)

The amount of time that it would take a Web browser to play the step element. This is a good metric for setting thresholds because it is the closest active measurement of what the user-experience is likely to be.

User Action

Use this metric to identify problem transactions. After you identify a step group that's slow to respond to user requests, you can drill down and analyze each phase of the step to isolate and repair the problem.