Information on Navigation Timings and how they work can be found at:

https://www.w3.org/TR/navigation-timing/

Navigation timing results are available on the waterfall chart or from the XML feed using Details=BrowserAction.navigationtimings

For example, substituting your own PID and Site ID in the following XML request

https://xmlreporter.dotcom-monitor.com/reporting/xml/responses.aspx?pid=XXXXXXXXXXXXXXXXXXX&Site=XXXXXX&Type=Detail&Options=RequestDetails&Details=BrowserAction

returns values in the following XML format:

<BrowserAction Type="BrowserPerformance">
<FetchStart>553</FetchStart>
<DomainLookupStart>553</DomainLookupStart>
<DomainLookupEnd>553</DomainLookupEnd>
<ConnectStart>553</ConnectStart>
<ConnectEnd>553</ConnectEnd>
<RequestStart>553</RequestStart>
<ResponseStart>553</ResponseStart>
<ResponseEnd>556</ResponseEnd>
<DomLoading>553</DomLoading>
<DomInteractive>1094</DomInteractive>
<DomContentLoadedEventStart>1094</DomContentLoadedEventStart>
<DomContentLoadedEventEnd>1248</DomContentLoadedEventEnd>
<DomComplete>2320</DomComplete>
<LoadEventStart>2339</LoadEventStart>
<LoadEventEnd>2344</LoadEventEnd>
</BrowserAction>