Web/API/WorkerGlobalScope/performance

The performance read-only property of the WorkerGlobalScope interface returns a Performance object to be used on the worker.

Not all Performance properties and methods are available to Web workers.

This property is Read only .

Syntax

var perfObj = self.performance;

Return Value

A Performance object.

Example

If you called

console.log(performance);

inside a worker (which would basically be the equivalent of self.console.log(self.performance);, as these are being called on the worker scope, which can be referenced with WorkerGlobalScope.self), you will get a WorkerPerformance object written to the console — something like the following:

WorkerPerformance {now: function}
  __proto__: WorkerPerformance
    constructor: function WorkerPerformance() { [native code] }
    now: function now() { [native code] }
    __proto__: Object

You could use this performance object to return performance data, as you might do with a normal Performance object.

Note: Firefox has a bug with using console.log inside shared/service workers (see bug 1058644), which may return strange results, but this should be fixed soon.

Specifications

Specification	Status	Comment
High Resolution Time Level 2The definition of 'performance' in that specification.	Recommendation	Defines WorkerGlobalScope.performance.

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
`performance`	Chrome Full support Yes	Edge Full support ≤79	Firefox Full support 34	IE No support No	Opera ?	Safari ?	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support 34	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support Yes

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown