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.



Working draft or equivalent

Status in Chromium


Enabled by default (tracking bug) in:

  • Chrome for desktop release 58
  • Chrome for Android release 58
  • Android WebView release 58

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

  • No signal
  • Positive
  • Positive
  • Strongly positive



Notes from TPAC discussion: https://docs.google.com/document/d/1RigHs7a4yRcVUt4fPswOZLKY_-tDlPiz8hPokBixHEk/edit#heading=h.mwr9aubzxuqt

Last updated on 2020-11-09