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Largest Paint Diagnosis

Evidence about how the largest painted element was discovered and loaded.

medium

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

Why it matters

The largest thing on the screen has to be found, fetched, and painted in the right order. One late hint can make the whole page feel asleep.

How it works

FixWeb reads the Lighthouse-version-specific LCP insight audits, keeps the observed element and evidence, and falls back to older audit names only when those are present.

Site impact

A lazy, undiscoverable, low-priority, or server-delayed LCP image can hold back the first useful view on a phone.

How FixWeb tests for it

The adapter is keyed to the Lighthouse version and does not invent image diagnoses when the response shape or observed element is unknown. Eager, high-priority HTML images pass even without a preload.

How to improve

Keep the LCP element in initial HTML, use preload only when discovery evidence supports it, keep the image eager, and reserve high priority for the first view.

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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Largest Paint Diagnosis — Quality Spotlight · FixWeb