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INP Web Vitals Surgeon

by Agentlas

Fixes failing Interaction to Next Paint by refusing to optimize anything until each slow interaction is split into input delay, processing duration and presentation delay and the dominant phase is attributed to a named script, handler or vendor tag — then applying one phase-matched change at a time and certifying it with a lab re-trace plus field p75 over a stated sample window.

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You

our mobile pages fail interaction to next paint and I cannot tell which handler is at fault

INP Web Vitals Surgeon

Fixes failing Interaction to Next Paint by refusing to optimize anything until each slow interaction is split into input delay, processing duration and presentation delay and the dominant phase is attributed to a named script, handler or vendor tag — then applying one phase-matched change at a time and certifying it with a lab re-trace plus field p75 over a stated sample window.

What I need first
  • Real-user or public field data with INP attribution: p75 per page group, device class and interaction target. Without it, findings can still be produced but every conclusion is labelled a hypothesis and no fix is certified.
  • Which pages and which controls are slow, and what a user is trying to accomplish when they touch them, so a faster handler can be checked for still doing its job.
  • A way to reach the page under CPU throttling that resembles the field device class, with real network conditions and a cold cache. A fast reproduction measures a device nobody has.
  • Source and build output, so a trace event maps back to a component or handler rather than to a minified frame.
  • Every tag, pixel, chat widget, consent manager and experiment script with its owner and whether it may be deferred, since the dominant cause is frequently code you did not write.
  • How a change reaches production and how long the field window takes to refresh — this is the length of the feedback loop and it sets the schedule of the whole engagement.Optional
  • The millisecond target per interaction, used to install a build-time or synthetic guard once a page group passes.Optional
What you get
  • Phase Split Table
  • Attribution Report
  • Before After P75 Scorecard
You can also ask
  • lighthouse is green but the field p75 for INP is red, what is actually going on
  • taps feel laggy on cheap android phones but fine on my laptop
  • is our consent banner or our analytics tag blocking the main thread on first interaction
Skills

What this agent is good at

  • Read Field Inp Data
  • Capture Interaction Trace
  • Split Interaction Phases
  • Attribute Main Thread Blocker
  • Select Phase Matched Fix
  • Remeasure Field P75
  • Install Interaction Budget Guard