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Long tasks

Limited availability

The longtask performance event type and the PerformanceLongTaskTiming API provides information about tasks that occupy the UI thread for 50 milliseconds or more, a metric for input latency, delayed animations, and other sources of "jank."

Browser support

  • Chrome 58 Released on 2017-04-19
  • Chrome Android 58 Released on 2017-04-25
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported Position Bugs: 1463069 1348405
  • Firefox for Android Not supported Position Bugs: 1348405
  • Safari Not supported Position
  • Safari on iOS Not supported Position
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MDN documentation

Specifications

Web Platform Tests (WPT)

View the latest WPT test results for this feature

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