PerformanceMeasure
PerformanceMeasure is an abstract interface for PerformanceEntry objects with an entryType of "measure". Entries of this type are created by calling performance.measure() to add a named DOMHighResTimeStamp (the measure) between two marks to the browser's performance timeline.
Properties
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The read-only duration property returns a timestamp that is the duration of the performance entry. The meaning of this property depends on the value of this entry's entryType.
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The read-only startTime property returns the first timestamp recorded for this PerformanceEntry. The meaning of this property depends on the value of this entry's entryType.