BOOMR.plugins. NavigationTiming

The Navigation Timing plugin collects performance metrics collected by modern user agents that support the W3C NavigationTiming specification.

This plugin also adds similar ResourceTiming metrics for any XHR beacons.

For information on how to include this plugin, see the Building tutorial.

Beacon Parameters

All beacon parameters are prefixed with nt_.

This plugin adds the following parameters to the beacon for Page Loads:

  • nt_red_cnt: performance.navigation.redirectCount
  • nt_nav_type: performance.navigation.type
  • nt_nav_st: performance.timing.navigationStart
  • nt_red_st: performance.timing.redirectStart
  • nt_red_end: performance.timing.redirectEnd
  • nt_fet_st: performance.timing.fetchStart
  • nt_dns_st: performance.timing.domainLookupStart
  • nt_dns_end: performance.timing.domainLookupEnd
  • nt_con_st: performance.timing.connectStart
  • nt_con_end: performance.timing.connectEnd
  • nt_req_st: performance.timing.requestStart
  • nt_res_st: performance.timing.responseStart
  • nt_res_end: performance.timing.responseEnd
  • nt_domloading: performance.timing.domLoading
  • nt_domint: performance.timing.domInteractive
  • nt_domcontloaded_st: performance.timing.domContentLoadedEventStart
  • nt_domcontloaded_end: performance.timing.domContentLoadedEventEnd
  • nt_domcomp: performance.timing.domComplete
  • nt_load_st: performance.timing.loadEventStart
  • nt_load_end: performance.timing.loadEventEnd
  • nt_unload_st: performance.timing.unloadEventStart
  • nt_unload_end: performance.timing.unloadEventEnd
  • nt_ssl_st: performance.timing.secureConnectionStart
  • nt_spdy: 1 if page was loaded over SPDY, 0 otherwise
  • nt_first_paint: The time when the first paint happened. On Internet Explorer, this is milliseconds since the epoch, while on Chrome this is seconds.microseconds since the epoch. If you detect a decimal point in this number, multiply it by 1000 to compare it to the other timers
  • nt_cinf: Chrome chrome.loadTimes().connectionInfo
  • nt_bad: If we detected that any NavigationTiming metrics looked odd, such as responseEnd in the far future or fetchStart before navigationStart.

For XHR beacons, the following parameters are added (via ResourceTiming):

  • nt_red_st: redirectStart
  • nt_red_end: redirectEnd
  • nt_fet_st: fetchStart
  • nt_dns_st: domainLookupStart
  • nt_dns_end: domainLookupEnd
  • nt_con_st: connectStart
  • nt_con_end: connectEnd
  • nt_req_st: requestStart
  • nt_res_st: responseStart
  • nt_res_end: responseEnd
  • nt_load_st: loadEventStart
  • nt_load_end: loadEventEnd
  • nt_ssl_st: secureConnectionStart




Initializes the plugin.

This plugin does not have any configuration.


BOOMR.plugins.NavigationTiming The IPv6 plugin for chaining


Whether or not this plugin is complete


Type: boolean

true if the plugin is complete