Performance

The performance global object and the Performance API provide access to performance-related information for the current execution context. To learn more, see Performance, Performance: clearMarks() method, Performance: clearMeasures() method, Performance: clearResourceTimings() method, Performance: getEntries() method, Performance: getEntriesByName() method, Performance: getEntriesByType() method, Performance: mark() method, Performance: measure() method, Performance: now() method, Performance: resourcetimingbufferfull event, Performance: setResourceTimingBufferSize() method, Performance: timeOrigin property, Performance: toJSON() method, PerformanceEntry, PerformanceEntry: duration property, PerformanceEntry: entryType property, PerformanceEntry: name property, PerformanceEntry: startTime property, PerformanceEntry: toJSON() method, PerformanceMark, PerformanceMark: PerformanceMark() constructor, PerformanceMark: detail property, PerformanceMeasure, PerformanceMeasure: detail property, PerformanceObserver, PerformanceObserver: PerformanceObserver() constructor, PerformanceObserver: disconnect() method, PerformanceObserver: observe() method, PerformanceObserver: supportedEntryTypes static property, PerformanceObserver: takeRecords() method, PerformanceObserverEntryList, PerformanceObserverEntryList: getEntries() method, PerformanceObserverEntryList: getEntriesByName() method, PerformanceObserverEntryList: getEntriesByType() method, WorkerGlobalScope: performance property, Timing-Allow-Origin at MDN.

Compatibility (view on caniuse.com)

• Chrome 6 Released on 2010-09-02
• Chrome Android 18 Released on 2012-06-27
• Edge 12 Released on 2015-07-29
• Firefox 7 Released on 2011-09-27
• Firefox for Android 7 Released on 2011-09-27
• Safari 8 Released on 2014-10-16
• Safari on iOS 9 Released on 2015-09-16