v133 · performance

LCP Attribution Builder

Reads the real LCP entry from this page using PerformanceObserver, shows the Chrome 133 coarsened renderTime, and generates a copy-ready attribution snippet for your RUM library.

checking LCP observer… checking renderTime…

Live LCP entry from this page

LCP element

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startTime

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renderTime (Chrome 133 — coarsened to 4ms multiple)

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loadTime

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Cross-origin? (TAO required for pre-133 non-zero renderTime)

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size (px²)

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Coarsening calculator

Enter any raw render timestamp to see what Chrome 133 would coarsen it to (floor to 4ms multiple).

Raw ms:

Raw value	Coarsened (4ms floor)	Error band	Pre-133 cross-origin (no TAO)

Generated RUM snippet

// Click "Observe LCP now" to generate