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# Web Page Diagnostics graphs overview

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 addition, you can view the relative download time and size of each page and its components. Analysis displays both average download time and download time over time data.

You correlate the data in the Web Page Diagnostics graphs with data in the Transaction Performance Summary and Average Transaction Response Time graphs in order to analyze why and where problems are occurring, and whether the problems are network- or server-related.

The following diagram illustrates the sequence of events from the time an HTTP request is sent:

Note: Because server time is being measured from the client, network time may influence this measurement if there is a change in network performance from the time the initial HTTP request is sent until the time the first buffer is sent. The server time displayed, therefore, is estimated server time and may be slightly inaccurate.

You begin analyzing the Transaction Performance Summary and Average Transaction Response Time graphs with the Web Page Diagnostics graph, which displays the average download time (in seconds) for each monitored web page during each second of the load test scenario run. The x-axis represents the elapsed time from the beginning of the scenario run. The y-axis represents the average download time (in seconds) for each web page.

These graphs can also be used for analyzing mobile applications using the Mobile Application - HTTP/HTML protocol.

In order for Analysis to generate Web Page Diagnostics graphs, you must enable the Web Page Diagnostics feature in Controller before running your scenario.

1. In Controller, from the menu, choose Diagnostics > Configuration and select the Enable the following diagnostics check box.
2. In the Offline Diagnostics section, if the button to the right of Web Page Diagnostics (Max. Vuser Sampling: 10%) says Enable, click it.

Note: When preparing a Web HTTP/HTML Vuser script for which you want to perform web diagnostics, it is recommended that you create an HTML-based script (using the Recording tab in the Recording Options).

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See also:

- Web page diagnostics

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