Web/API/PerformanceObserver

From Get docs


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.

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 perf_observer(list, observer) { 
   // Process the "measure" event 
} 
var observer2 = new PerformanceObserver(perf_observer); 
observer2.observe({entryTypes: ["measure"]});

Specifications

Specification Status Comment
Performance Timeline Level 2The definition of 'PerformanceObserver' in that specification. Candidate Recommendation Initial definition of PerformanceObserver interface.

Browser compatibility

Update compatibility data on GitHub

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
PerformanceObserver Chrome

Full support 52

Edge

Full support ≤79

Firefox

Full support 57

IE

No support No

Opera

Full support 39

Safari

Full support 11

WebView Android

Full support 52

Chrome Android

Full support 52

Firefox Android

Full support 57

Opera Android

Full support 41

Safari iOS

Full support 11

Samsung Internet Android

Full support 6.0

PerformanceObserver() constructor Chrome

Full support 52

Edge

Full support ≤79

Firefox

Full support 57

IE

No support No

Opera

Full support 39

Safari

Full support 11

WebView Android

Full support 52

Chrome Android

Full support 52

Firefox Android

Full support 57

Opera Android

Full support 41

Safari iOS

Full support 11

Samsung Internet Android

Full support 6.0

disconnect Chrome

Full support 52

Edge

Full support ≤79

Firefox

Full support 57

IE

No support No

Opera

Full support 39

Safari

Full support 11

WebView Android

Full support 52

Chrome Android

Full support 52

Firefox Android

Full support 57

Opera Android

Full support 41

Safari iOS

Full support 11

Samsung Internet Android

Full support 6.0

observe Chrome

Full support 52

Edge

Full support ≤79

Firefox

Full support 57

IE

No support No

Opera

Full support 39

Safari

Full support 11

WebView Android

Full support 52

Chrome Android

Full support 52

Firefox Android

Full support 57

Opera Android

Full support 41

Safari iOS

Full support 11

Samsung Internet Android

Full support 6.0

supportedEntryTypes

Experimental'

Chrome

Full support 73

Edge

Full support ≤79

Firefox

?

IE

No support No

Opera

Full support Yes

Safari

Full support 12.1

WebView Android

Full support 73

Chrome Android

Full support 73

Firefox Android

?

Opera Android

Full support Yes

Safari iOS

Full support 12.2

Samsung Internet Android

Full support 11.0

takeRecords

Experimental'

Chrome

Full support 65

Edge

Full support ≤79

Firefox

Full support 60

IE

No support No

Opera

Full support Yes

Safari

No support No

WebView Android

Full support 65

Chrome Android

Full support 65

Firefox Android

Full support 60

Opera Android

Full support Yes

Safari iOS

No support No

Samsung Internet Android

Full support 9.0

Available in workers Chrome

Full support 62

Edge

Full support ≤79

Firefox

?

IE

No support No

Opera

Full support 49

Safari

?

WebView Android

Full support 62

Chrome Android

Full support 62

Firefox Android

?

Opera Android

Full support 46

Safari iOS

?

Samsung Internet Android

Full support 8.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.'
Experimental. Expect behavior to change in the future.


See also