Long tasks
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."
Status
Limited availability
MDN documentation
Specifications
- Long Tasks API, from Web Performance Working Group (W3C).
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 ❌ See bugzil.la/1348405 Vendor position : unknown
- Firefox for Android ❌ See bugzil.la/1348405 Vendor position : unknown
- Safari ❌ Vendor position : unknown
- Safari on iOS ❌ Vendor position : unknown
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