PerformanceTiming

This interface is deprecated in the Navigation Timing Level 2 specification. Please use the PerformanceNavigationTiming interface instead.

The PerformanceTiming interface is a legacy interface kept for backwards compatibility and contains properties that offer performance timing information for various events which occur during the loading and use of the current page. You get a PerformanceTiming object describing your page using the window.performance.timing property.

Properties

The PerformanceTiming interface doesn't inherit any properties.

These properties each describe the time at which a particular point in the page loading process was reached. Some correspond to DOM events; others describe the time at which internal browser operations of interest took place.

Each time is provided as an unsigned long long representing the moment, in milliseconds since the UNIX epoch

These properties are listed in the order in which they occur during the navigation process.

PerformanceTiming.navigationStart Read only
When the prompt for unload terminates on the previous document in the same browsing context. If there is no previous document, this value will be the same as PerformanceTiming.fetchStart.
PerformanceTiming.unloadEventStart Read only
When the unload event has been thrown, indicating the time at which the previous document in the window began to unload. If there is no previous document, or if the previous document or one of the needed redirects is not of the same origin, the value returned is 0.
  PerformanceTiming.unloadEventEnd Read only
When the unload event handler finishes. If there is no previous document, or if the previous document, or one of the needed redirects, is not of the same origin, the value returned is 0.
  PerformanceTiming.redirectStart Read only
When the first HTTP redirect starts. If there is no redirect, or if one of the redirects is not of the same origin, the value returned is 0.
  PerformanceTiming.redirectEnd Read only
When the last HTTP redirect is completed, that is when the last byte of the HTTP response has been received. If there is no redirect, or if one of the redirects is not of the same origin, the value returned is 0.
  PerformanceTiming.fetchStart Read only
When the browser is ready to fetch the document using an HTTP request. This moment is before the check to any application cache.
  PerformanceTiming.domainLookupStart Read only
When the domain lookup starts. If a persistent connection is used, or the information is stored in a cache or a local resource, the value will be the same as PerformanceTiming.fetchStart.
  PerformanceTiming.domainLookupEnd Read only
When the domain lookup is finished. If a persistent connection is used, or the information is stored in a cache or a local resource, the value will be the same as PerformanceTiming.fetchStart.
  PerformanceTiming.connectStart Read only
When the request to open a connection is sent to the network. If the transport layer reports an error and the connection establishment is started again, the last connection establishment start time is given. If a persistent connection is used, the value will be the same as PerformanceTiming.fetchStart.
  PerformanceTiming.connectEnd Read only
When the connection is opened network. If the transport layer reports an error and the connection establishment is started again, the last connection establishment end time is given. If a persistent connection is used, the value will be the same as PerformanceTiming.fetchStart. A connection is considered as opened when all secure connection handshake, or SOCKS authentication, is terminated.
  PerformanceTiming.secureConnectionStart Read only
When the secure connection handshake starts. If no such connection is requested, it returns 0.
  PerformanceTiming.requestStart Read only
When the browser sent the request to obtain the actual document, from the server or from a cache. If the transport layer fails after the start of the request and the connection is reopened, this property will be set to the time corresponding to the new request.
  PerformanceTiming.responseStart Read only
When the browser received the first byte of the response, from the server from a cache, or from a local resource.
  PerformanceTiming.responseEnd Read only
When the browser received the last byte of the response, or when the connection is closed if this happened first, from the server, the cache, or from a local resource.
  PerformanceTiming.domLoading Read only
When the parser started its work, that is when its Document.readyState changes to 'loading' and the corresponding readystatechange event is thrown.
  PerformanceTiming.domInteractive Read only
When the parser finished its work on the main document, that is when its Document.readyState changes to 'interactive' and the corresponding readystatechange event is thrown.
  PerformanceTiming.domContentLoadedEventStart Read only
Right before the parser sent the DOMContentLoaded event, that is right after all the scripts that need to be executed right after parsing have been executed.
  PerformanceTiming.domContentLoadedEventEnd Read only
Right after all the scripts that need to be executed as soon as possible, in order or not, have been executed.
  PerformanceTiming.domComplete Read only
When the parser finished its work on the main document, that is when its Document.readyState changes to 'complete' and the corresponding readystatechange event is thrown.
  PerformanceTiming.loadEventStart Read only
When the load event was sent for the current document. If this event has not yet been sent, it returns 0.
  PerformanceTiming.loadEventEnd Read only
When the load event handler terminated, that is when the load event is completed. If this event has not yet been sent, or is not yet completed, it returns 0.

Methods

The PerformanceTiming interface doesn't inherit any methods.

  PerformanceTiming.toJSON()
Returns a JSON object representing this PerformanceTiming object.

Specifications

Specification Status Comment
Navigation Timing
The definition of 'PerformanceTiming' in that specification.
Recommendation Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
Deprecated
Chrome Full support 6Edge Full support 12Firefox Full support 7IE Full support 9Opera Full support 15Safari Full support 8WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS Full support 9.2Samsung Internet Android ?
connectEnd
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
connectStart
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
domComplete
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
domContentLoadedEventEnd
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari Full support 8WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS Full support 9.2Samsung Internet Android ?
domContentLoadedEventStart
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
domInteractive
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
domLoading
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
domainLookupEnd
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
domainLookupStart
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
fetchStart
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS Full support YesSamsung Internet Android ?
loadEventEnd
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
loadEventStart
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
navigationStart
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS Full support YesSamsung Internet Android ?
redirectEnd
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
redirectStart
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
requestStart
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
responseEnd
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
responseStart
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
secureConnectionStart
Deprecated
Chrome Full support 6Edge Full support 18Firefox Full support 56IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile ? Firefox Android Full support 56Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
toJSON
Deprecated
Chrome Full support 44Edge Full support YesFirefox Full support 25IE Full support 9Opera Full support 32Safari Full support YesWebView Android Full support 44Chrome Android Full support 44Edge Mobile Full support YesFirefox Android Full support 25Opera Android Full support 32Safari iOS Full support YesSamsung Internet Android ?
unloadEventEnd
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?
unloadEventStart
Deprecated
Chrome Full support 6Edge Full support YesFirefox Full support 7IE Full support 9Opera Full support 15Safari No support NoWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 7Opera Android Full support 15Safari iOS No support NoSamsung Internet Android ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.

See also