[HTTP Step] Perceived Slowest Page Element Time (ms)

The amount of time that it would take a Web browser to play the slowest 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 pages. After you identify a page or transaction that's slow to response respond to user requests, you can drill down and analyze each phase of the transaction to isolate and repair the problem