performancegoogle-analyticsnavigation-timing-api

How do the metrics of Google Analytics Site Speed map to the W3C Navigation Timing API?

The explanations of the site speed metrics provided on Dimensions & Metrics Reference are unclear (at least to me). They represent events in the Navigation Timing API but I cannot figure out which events are the start and end points of each metric.

Solution

  • GA metric names (left) to Navigation Timing labels (right):

            pageLoadTime = loadEventStart - navigationStart
    domainLookupTime = domainLookupEnd - domainLookupStart
serverConnectionTime = connectEnd - connectStart
  serverResponseTime = responseStart - requestStart
    pageDownloadTime = responseEnd - responseStart
     redirectionTime = fetchStart - navigationStart
  domInteractiveTime = domInteractive - navigationStart
domContentLoadedTime = domContentLoadedEventStart - navigationStart