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Measured Mobile Vitals

Real-user and simulated-phone LCP, INP, and CLS measurements.

medium

Performance delivery
15tests fired in this category
modules
3dedicated performance delivery checks
every scan
299+tests across all categories

Why it matters

A fast desktop glance is not the same as a phone feeling quick. Measured mobile data shows where visitors actually wait or lose their place.

How it works

FixWeb requests one mobile PageSpeed Insights result, prefers page field data, falls back to origin-wide field data, and uses lab LCP and CLS only when field values are unavailable. INP is field-only.

Site impact

Slow LCP delays the first useful view, slow INP makes taps feel ignored, and layout shift makes people lose their place or press the wrong control.

How FixWeb tests for it

The performance lane stores the PSI provenance, metric category, collection period, and lab context. If the provider is unavailable or has no field record, the affected slot stays not measured.

How to improve

Make the LCP resource discoverable and fast, keep JavaScript work small enough for quick input response, and reserve space for every image and late-loading element.

Run it on your own site

Keep improving while FixWeb keeps watch.

FixWeb crawls public pages like a real browser, then organizes crawl, search, content, accessibility, performance, media, form, runtime, browser-compatibility, owner-data, and repo findings into practical improvement prompts for Cursor, Claude, and Copilot.

  • $9 once, no subscription
  • Just paste a URL — we crawl, analyze, and report
  • Severity-graded quality issues, deduped to signal only
  • Current, AI-ready improvement prompts you can paste into Cursor, Claude, Copilot
Check my site →latest modules · practical fixes · better websites
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