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 2
The definition of 'performance' in that specification.
Candidate Recommendation Defines WorkerGlobalScope.performance.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support YesEdge ? Firefox Full support 34IE ? Opera ? Safari ? WebView Android ? Chrome Android Full support YesEdge Mobile ? Firefox Android Full support 34Opera Android ? Safari iOS ? Samsung Internet Android Full support Yes

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

See also

Document Tags and Contributors

Contributors to this page: fscholz, AFBarstow, teoli, chrisdavidmills, Bzbarsky
Last updated by: fscholz,