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PerformanceResourceTiming.connectEnd

The connectEnd property returns the timestamp immediately after the browser finishes establishing the connection to the server to retrieve the resource. The timestamp value includes the time interval to establish the transport connection, as well as other time intervals such as SSL handshake and SOCKS authentication.
API Property Reference Web Performance

PerformanceResourceTiming.decodedBodySize

The decodedBodySize property returns the size (in octets) received from the fetch (HTTP or cache) of the message body, after removing any applied content-codings. If the resource is retrieved from an application cache or local resources, it returns the size of the payload after removing any applied content-codings.
API Property Reference Web Performance

PerformanceResourceTiming.domainLookupEnd

The domainLookupEnd property returns the timestamp immediately after the browser finishes the domain name lookup for the resource.
API Property Reference Web Performance

PerformanceResourceTiming.domainLookupStart

The domainLookupStart property returns the timestamp immediately before the browser starts the domain name lookup for the resource.
API Property Reference Web Performance

PerformanceResourceTiming.encodedBodySize

The encodedBodySize property represents the size (in octets) received from the fetch (HTTP or cache), of the payload body, before removing any applied content-codings.
API Property Reference Web Performance

PerformanceResourceTiming.fetchStart

The fetchStart property represents a timestamp immediately before the browser starts to fetch the resource.
API Property Reference Web Performance

PerformanceResourceTiming.initiatorType

The initiatorType property is a string that represents the type of resource that initiated the performance event. The value of this string is as follows:
API Property Reference Web Performance

PerformanceResourceTiming.nextHopProtocol

The nextHopProtocol property is a string representing the network protocol used to fetch the resource, as identified by the ALPN Protocol ID (RFC7301).
API Property Reference Web Performance

PerformanceResourceTiming.redirectEnd

The redirectEnd property returns a timestamp immediately after receiving the last byte of the response of the last redirect.
API Property Reference Web Performance

PerformanceResourceTiming.redirectStart

The redirectStart property returns a timestamp representing the start time of the fetch which that initiates the redirect.
API Property Reference Web Performance

PerformanceResourceTiming.requestStart

The requestStart property returns a timestamp of the time immediately before the browser starts requesting the resource from the server, cache, or local resource. If the transport connection fails and the browser retires the request, the value returned will be the start of the retry request.
API Property Reference Web Performance

PerformanceResourceTiming.responseEnd

The responseEnd property returns a timestamp immediately after the browser receives the last byte of the resource or immediately before the transport connection is closed, whichever comes first.
API Property Reference Web Performance

PerformanceResourceTiming.responseStart

The responseStart property returns a timestamp immediately after the browser receives the first byte of the response from the server, cache, or local resource.
API Property Reference Web Performance

PerformanceResourceTiming.secureConnectionStart

The secureConnectionStart property returns a timestamp immediately before the browser starts the handshake process to secure the current connection. If a secure connection is not used, the property returns zero.
API Property Reference Web Performance

PerformanceResourceTiming.toJSON()

The toJSON() method is a serializer that returns a JSON representation of the PerformanceResourceTiming object.
API Method Reference Web Performance

PerformanceResourceTiming.transferSize

The transferSize property represents the size (in octets) of the fetched resource. The size includes the response header fields plus the response payload body (as defined by RFC7230.
API Property Reference Web Performance

PerformanceResourceTiming.workerStart

If the current context is a worker, the workerStart property returns a timestamp immediately before the worker that fetches the resource is started. If the context is not a worker (i.e. a browser context), this property returns zero.
API Property Reference Web Performance

Performance API

The High Resolution Time standard defines a Performance interface that supports client-side latency measurements within applications. The Performance interfaces are considered high resolution because they are accurate to a thousandth of a millisecond (subject to hardware or software constraints). The interfaces support a number of use cases including calculating frame-rates (potentially important in animations) and benchmarking (such as the time to load a resource).
Guide NeedsContent Overview performance Performance Web Performance

PeformanceObserver.disconnect()

The disconnect() method of the PerformanceObserver interface is used to stop the performance observer from receiving any performance entry events.
API Method PerformanceObserver Reference Web Performance

PerformanceObserver.observe()

The observe() method of the PerformanceObserver interface is used to specify the set of performance interface types to observe. The performance observer's callback function will be invoked when a performance entry is recorded for one of the specified types.
API Method PerformanceObserver Reference Web Performance