PerformanceThe performance global object and the PerformanceObserver API provide access to performance-related information for the current execution context.performancePerformancewidely2015-09-162018-03-16https://w3c.github.io/hr-time/https://w3c.github.io/performance-timeline/https://w3c.github.io/user-timing/#extensions-performance-interfaceuser-timinghigh-resolution-timehttps://developer.mozilla.org/docs/Web/API/Performanceapi.Performanceapi.Performance.clearMarksapi.Performance.clearMeasuresapi.Performance.getEntriesapi.Performance.getEntriesByNameapi.Performance.getEntriesByTypeapi.Performance.markapi.Performance.mark.markOptions_parameterapi.Performance.mark.returns_performancemarkapi.Performance.measureapi.Performance.measure.measureOptions_parameterapi.Performance.measure.returns_performancemeasureapi.Performance.nowapi.Performance.timeOriginapi.Performance.toJSONapi.PerformanceEntryapi.PerformanceEntry.durationapi.PerformanceEntry.entryTypeapi.PerformanceEntry.nameapi.PerformanceEntry.startTimeapi.PerformanceEntry.toJSONapi.PerformanceEntry.worker_supportapi.PerformanceMarkapi.PerformanceMark.PerformanceMarkapi.PerformanceMark.detailapi.PerformanceMeasureapi.PerformanceMeasure.detailapi.PerformanceObserverapi.PerformanceObserver.PerformanceObserverapi.PerformanceObserver.PerformanceObserver.droppedEntriesCountapi.PerformanceObserver.disconnectapi.PerformanceObserver.observeapi.PerformanceObserver.supportedEntryTypes_staticapi.PerformanceObserver.takeRecordsapi.PerformanceObserver.worker_supportapi.PerformanceObserverEntryListapi.PerformanceObserverEntryList.getEntriesapi.PerformanceObserverEntryList.getEntriesByNameapi.PerformanceObserverEntryList.getEntriesByTypeapi.performanceapi.performance.worker_supporthttp.headers.Timing-Allow-Originhttps://nowyoucanuse.com/features--performance.html