Individual skill
largest-contentful-paint
Use when auditing slow page loads, heavy assets, or rendering delays related to Optimize largest contentful paint. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.
skills/largest-contentful-paint/SKILL.md
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- Skill scan complete
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- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
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Repository context
- Repository stars (not skill ratings)
- 74,693
- Repository last updated
- Oct 31, 2026
- License
- MIT
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- frontend Repository topic
- front-end-development Repository topic
- front-end-developer-tool Repository topic
- guidelines Repository topic
- checklist Repository topic
- reference Repository topic
- web-development Repository topic
- html Repository topic
- css Repository topic
- javascript Repository topic
- data Derived category
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SKILL.mdcore · 1,765 bytesreferences/rule.mddoc · 4,220 bytes
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# Optimize largest contentful paint
LCP is the most important Core Web Vital for perceived load speed—it measures when the main content becomes visible, directly impacting user perception and SEO rankings.
## Quick Reference
- LCP measures when the largest element renders—target under 2.5s
- Use preload for hero images and critical resources
- Optimize image formats and use responsive sizes
- Reduce server response time (TTFB)
## Check
Measure LCP using Lighthouse or PageSpeed Insights. Verify the largest visible element renders within 2.5 seconds.