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The performance.now () method returns a high resolution timestamp in milliseconds. It represents the time elapsed since Performance.timeOrigin (the time when navigation has started in window contexts, or the time when the worker is run in Worker and ServiceWorker contexts).
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JavaScript performance.now () Method. In JavaScript performance.now () method can be used to check the performance of your code. You can check the execution time of your code using this method. Syntax: Parameter: It does not take any parameter. Return value: It returns value of time in milliseconds.
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Date.now() returns the number of milliseconds elapsed since 1 January 1970 00:00:00 UTC, performance.now() returns the number of milliseconds/microseconds elapsed since an arbitrary epoch. Basically, performance.now() should only be used when you want to measure the relative distance between two time points, not their "absolute" position in time.
performance.now() is a measurement of floating point milliseconds since that particular page started to load (the performance.timing.[navigationStart](https://www.w3.org/TR/navigation-timing/#dom-performancetiming-navigationstart) timeStamp to be specific).
performance.now() returns different values when we change the order of execution
Node.js supports the following Web Performance APIs: const obs = new PerformanceObserver((items) => {. console.log(items.getEntries()[0].duration); performance.clearMarks(); doSomeLongRunningProcess(() => {. performance.measure('A to Now', 'A'); performance.mark('B'); performance.measure('A to B', 'A', 'B');
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Performance.now() Returns a DOMHighResTimeStamp representing the number of milliseconds elapsed since a reference instant.