Long Task API

Category: JavaScript
Type: New or changed feature
Status: Enabled by default (Chrome 58)
Intent stage: None

Summary

A performance API to enable applications to detect presence of “long tasks” that monopolize the UI thread for extended periods of time and block other critical tasks from being executed - e.g. reacting to user input.

Standards & signals

Specification: https://w3c.github.io/longtasks/
Firefox: No signal
Safari: Positive
Web developers: Strongly positive
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=651926

Docs: https://github.com/w3c/longtasks https://developer.mozilla.org/en-US/docs/Web/API/Long_Tasks_API

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