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Web Experience & AnalyticsD-05Previous work

Page Vitals

Field instrumentation for real user performance

Timeline
2024
Availability
Not publicly reachable
Repositories
1
Role
Design, architecture and implementation
Summary
A lightweight collector for Core Web Vitals and related timings from real sessions, built to add negligible weight to the page it measures.

What it is

Lab scores are a rehearsal; field data is the performance. This collector observes the relevant entry types, attributes them to a session, and ships them with a beacon on page hide — measuring performance without becoming the thing that degrades it.

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