WorkerGlobalScope.performance

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

This property is Read only .

A Performance object.

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.

• Performance