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PerformanceObserver

The PerformanceObserver interface is used to observe performance measurement events and be notified of new performance entries as they are recorded in the browser's performance timeline.

Note: This feature is available in Web Workers

Constructor

PerformanceObserver()

Creates and returns a new PerformanceObserver object.

Properties

PerformanceObserver.supportedEntryTypesRead only

Returns an array of the entryType values supported by the user agent.

Methods

PerformanceObserver.observe()

Specifies the set of entry types to observe. The performance observer's callback function will be invoked when a performance entry is recorded for one of the specified entryTypes

PerformanceObserver.disconnect()

Stops the performance observer callback from receiving performance entries.

PerformanceObserver.takeRecords()

Returns the current list of performance entries stored in the performance observer, emptying it out.

Example

function observer_callback(list, observer) {
   // Process the "measure" event
}
let observer = new PerformanceObserver(observer_callback);
observer.observe({entryTypes: ["measure"]});

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
PerformanceObserver
52
79
57
No
39
11
52
52
57
41
11
6.0
PerformanceObserver
52
79
57
No
39
11
52
52
57
41
11
6.0
disconnect
52
79
57
No
39
11
52
52
57
41
11
6.0
observe
52
79
57
No
39
11
52
52
57
41
11
6.0
supportedEntryTypes
73
79
68
No
Yes
12.1
73
73
68
Yes
12.2
11.0
takeRecords
65
79
60
No
Yes
15
65
65
60
Yes
15
9.0
worker_support
62
79
57
No
49
11
62
62
57
46
11
8.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/PerformanceObserver