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Speed Index in Lighthouse: Crawl Audit check 77

Crawl Audit check 77 measures how quickly your page fills in visually. Lighthouse's 3.4 second target, how it's scored, and what improves it.

Zain Kazmi2 min read
On this page
  1. What Crawl Audit checks
  2. What Google says
  3. On devmarde.com
  4. What improves it
  5. Sources
Check
77 of 200
Module
Performance & Core Web Vitals
Group
Core Web Vitals Metrics
Impact
Medium

Short answer: Speed Index measures how fast the visible part of your page fills in, not just when the first or largest thing appears. It's a Lighthouse lab metric, worth 10% of the performance score. Check 77 passes at 3.4 seconds or less, warns up to 5.8 seconds and fails above that, matching Lighthouse's mobile bands.

What Crawl Audit checks

  • Full report: Lighthouse's Speed Index from PageSpeed Insights.
  • Free check: an estimate from your homepage's load time and server response. A rough guide only.
  • Pass: 3.4s or less. Warning: up to 5.8s. Fail: over 5.8s.

What Google says

  • Lighthouse: "Speed Index measures how quickly content is visually displayed during page load."
  • On mobile, 0 to 3.4 seconds is green, 3.4 to 5.8 orange, and over 5.8 red. Desktop bands are tighter: 1.3 and 2.3 seconds.

On devmarde.com

On 3 October, PageSpeed Insights measured our homepage Speed Index at 1.9 seconds on mobile.

What improves it

The same things that help FCP and LCP (checks 75 and 72): a fast server response, fewer render-blocking files, light images in the first screen, and text that shows while web fonts load.

Sources

All 200 Crawl Audit checks

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