User Timing L3

Category: Performance
Type: New or changed feature
Status: Enabled by default (Chrome 78)
Intent stage: Prepare to ship

Summary

User Timing Level 3 extends the existing User Timing API to enable two new use cases: 1. Developers can pass custom timestamps to performance.measure() and performance.mark(), so as to conduct measurement across arbitrary timestamps. 2. Developers can report arbitrary metadata with performance.mark() and performance.measure(), which provides rich data to analytics via a standardized API.

Standards & signals

Specification: https://w3c.github.io/user-timing/
Firefox: No signal
Safari: No signal
Web developers: No signals
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=758385

Explainers: https://docs.google.com/document/d/1hltt8z9C4PaI5Qu1YMIp1wOGdbJPJPoJwBarEeCY6xQ/edit

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