PerformanceResourceTiming

The connectEnd read-only property returns the DOMHighResTimeStamp immediately after the browser finishes establishing the connection to the server to retrieve the resource.

The connectStart read-only property returns the DOMHighResTimeStamp immediately before the user agent starts establishing the connection to the server to retrieve the resource.

The decodedBodySize read-only property returns the size (in octets) received from the fetch (HTTP or cache) of the message body after removing any applied content encoding (like gzip or Brotli).

The domainLookupEnd read-only property returns the DOMHighResTimeStamp immediately after the browser finishes the domain-name lookup for the resource.

The domainLookupStart read-only property returns the DOMHighResTimeStamp immediately before the browser starts the domain name lookup for the resource.

The read-only duration property returns a DOMHighResTimeStamp that is the duration of the PerformanceEntry.

The encodedBodySize read-only property represents the size (in octets) received from the fetch (HTTP or cache) of the payload body before removing any applied content encodings (like gzip or Brotli).

The read-only entryType property returns a string representing the type of performance metric that this entry represents.

The fetchStart read-only property represents a DOMHighResTimeStamp immediately before the browser starts to fetch the resource.

The initiatorType read-only property is a string representing web platform feature that initiated the resource load.

The read-only name property of the PerformanceEntry interface is a string representing the name for a performance entry.

The nextHopProtocol read-only property is a string representing the network protocol used to fetch the resource, as identified by the ALPN Protocol ID (RFC7301).

The redirectEnd read-only property returns a DOMHighResTimeStamp immediately after receiving the last byte of the response of the last redirect.

The redirectStart read-only property returns a DOMHighResTimeStamp representing the start time of the fetch which that initiates the redirect.

The requestStart read-only property returns a DOMHighResTimeStamp of the time immediately before the browser starts requesting the resource from the server, cache, or local resource.

The responseEnd read-only property returns a DOMHighResTimeStamp immediately after the browser receives the last byte of the resource or immediately before the transport connection is closed, whichever comes first.

The responseStart read-only property returns a DOMHighResTimeStamp immediately after the browser receives the first byte of the response from the server, cache, or local resource.

The responseStatus read-only property represents the HTTP response status code returned when fetching the resource.

The secureConnectionStart read-only property returns a DOMHighResTimeStamp immediately before the browser starts the handshake process to secure the current connection.

The serverTiming read-only property returns an array of PerformanceServerTiming entries containing server timing metrics.

The read-only startTime property returns the first DOMHighResTimeStamp recorded for this PerformanceEntry.

The transferSize read-only property represents the size (in octets) of the fetched resource.

The workerStart read-only property of the PerformanceResourceTiming interface returns a DOMHighResTimeStamp immediately before dispatching the FetchEvent if a Service Worker thread is already running, or immediately before starting the Service Worker thread if it is not already running.

The toJSON() method of the PerformanceResourceTiming interface is a Serialization; it returns a JSON representation of the PerformanceResourceTiming object.