INP Diagnostics Playground

Prototype Interaction to Next Paint fixes by modelling event chains in the browser.

Workflow

Paste PerformanceEventTiming JSON or craft events manually to see INP rollups instantly.

Add interaction event

Add events or import JSON captured from PerformanceEventTiming.

Overview

Compose interaction traces to estimate Interaction to Next Paint before field data arrives.

How to use

  1. Import PerformanceEventTiming JSON or add events manually.
  2. Adjust processing and presentation timings to mirror lab investigations.
  3. Review p75 and worst-case numbers, then capture next steps for the team.

Use cases

  • Prototype mitigation ideas before shipping experiments.
  • Document INP regressions with reproducible chains.
  • Explain INP components to designers and PMs visually.

Tips & knowledge

  • Pair with Chrome trace viewer to confirm real frames.
  • Validate lab assumptions with RUM percentiles regularly.
  • Attach exported CSVs to bug tickets for shared vocabulary.

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