You will need to use the Web Page Diagnostics graphs within LoadRunner Professional Analysis to drill down and inspect the download time of the web pages and web page components.
Micro Focus States the following:
"Web Page Diagnostics graphs provide you with performance information for each monitored web page in your script. You can view
the download time of each page in the script and its components, and identify at what point during download time problems occurred."
In order for Analysis to generate Web Page Diagnostics graphs, you must enable the Web Page Diagnostics feature in Controller before running your scenario.
- In Controller, from the menu, choose Diagnostics > Configuration and select the Enable the following diagnostics check box.
- In the Offline Diagnostics section, if the button to the right of Web Page Diagnostics (Max. Vuser Sampling: 10%) says Enable, click it.
Please see the link below for more information:
I hope this helps.