性能 – Google Analytics Site Speed的指标如何映射到W3C Navigation Timing API？

对 Dimensions & Metrics Reference提供的网站速度指标的解释尚不清楚(至少对我而言).它们代表 Navigation Timing API中的事件,但我无法确定哪些事件是每个指标的起点和终点. GA指标名称(左)到导航计时标签(右)：

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