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    Interface PerformanceTiming

    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.

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

    MDN Reference

    interface PerformanceTiming {
        connectEnd: number;
        connectStart: number;
        domainLookupEnd: number;
        domainLookupStart: number;
        domComplete: number;
        domContentLoadedEventEnd: number;
        domContentLoadedEventStart: number;
        domInteractive: number;
        domLoading: number;
        fetchStart: number;
        loadEventEnd: number;
        loadEventStart: number;
        navigationStart: number;
        redirectEnd: number;
        redirectStart: number;
        requestStart: number;
        responseEnd: number;
        responseStart: number;
        secureConnectionStart: number;
        unloadEventEnd: number;
        unloadEventStart: number;
        toJSON(): any;
    }
    Index

    Properties

    connectEnd connectStart domainLookupEnd domainLookupStart domComplete domContentLoadedEventEnd domContentLoadedEventStart domInteractive domLoading fetchStart loadEventEnd loadEventStart navigationStart redirectEnd redirectStart requestStart responseEnd responseStart secureConnectionStart unloadEventEnd unloadEventStart

    Methods

    toJSON

    Properties

    connectEnd: number

    The legacy PerformanceTiming.connectEnd read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, where 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.

    MDN Reference

    connectStart: number

    The legacy PerformanceTiming.connectStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, where 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.

    MDN Reference

    domainLookupEnd: number

    The legacy PerformanceTiming.domainLookupEnd read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, where 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.

    MDN Reference

    domainLookupStart: number

    The legacy PerformanceTiming.domainLookupStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, where 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.

    MDN Reference

    domComplete: number

    The legacy PerformanceTiming.domComplete read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, 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.

    MDN Reference

    domContentLoadedEventEnd: number

    The legacy PerformanceTiming.domContentLoadedEventEnd read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, right after all the scripts that need to be executed as soon as possible, in order or not, has been executed.

    MDN Reference

    domContentLoadedEventStart: number

    The legacy PerformanceTiming.domContentLoadedEventStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, right before the parser sent the DOMContentLoaded event, that is right after all the scripts that need to be executed right after parsing has been executed.

    MDN Reference

    domInteractive: number

    The legacy PerformanceTiming.domInteractive read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, 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.

    MDN Reference

    domLoading: number

    The legacy PerformanceTiming.domLoading read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, when the parser started its work, that is when its Document.readyState changes to 'loading' and the corresponding readystatechange event is thrown.

    MDN Reference

    fetchStart: number

    The legacy PerformanceTiming.fetchStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, the browser is ready to fetch the document using an HTTP request. This moment is before the check to any application cache.

    MDN Reference

    loadEventEnd: number

    The legacy PerformanceTiming.loadEventEnd read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, 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.

    MDN Reference

    loadEventStart: number

    The legacy PerformanceTiming.loadEventStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, when the load event was sent for the current document. If this event has not yet been sent, it returns 0.

    MDN Reference

    navigationStart: number

    The legacy PerformanceTiming.navigationStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, right after 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.

    MDN Reference

    redirectEnd: number

    The legacy PerformanceTiming.redirectEnd read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, 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 redirect is not of the same origin, the value returned is 0.

    MDN Reference

    redirectStart: number

    The legacy PerformanceTiming.redirectStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, the first HTTP redirect starts. If there is no redirect, or if one of the redirect is not of the same origin, the value returned is 0.

    MDN Reference

    requestStart: number

    The legacy PerformanceTiming.requestStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, 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.

    MDN Reference

    responseEnd: number

    The legacy PerformanceTiming.responseEnd read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, when the browser received the last byte of the response, or when the connection is closed if this happened first, from the server from a cache or from a local resource.

    MDN Reference

    responseStart: number

    The legacy PerformanceTiming.responseStart read-only property returns an unsigned long long representing the moment in time (in milliseconds since the UNIX epoch) when the browser received the first byte of the response from the server, cache, or local resource.

    MDN Reference

    secureConnectionStart: number

    The legacy PerformanceTiming.secureConnectionStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, where the secure connection handshake starts. If no such connection is requested, it returns 0.

    MDN Reference

    unloadEventEnd: number

    The legacy PerformanceTiming.unloadEventEnd read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, 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.

    MDN Reference

    unloadEventStart: number

    The legacy PerformanceTiming.unloadEventStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, the unload event has been thrown. 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.

    MDN Reference

    Methods

    • The legacy toJSON() method of the PerformanceTiming interface is a serializer; it returns a JSON representation of the PerformanceTiming object.

      Returns any

      MDN Reference

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