Individual skill
render-blocking
Use when auditing slow page loads, heavy assets, or rendering delays related to Eliminate render-blocking resources. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.
skills/render-blocking/SKILL.md
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- Observed behavior
- Instructions only
- Last checked
- Nov 9, 2026
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- 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 · 1,719 bytesreferences/rule.mddoc · 4,577 bytes
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# Eliminate render-blocking resources
Render-blocking resources prevent the browser from painting anything on the screen, leading to a "white screen" effect and poor user experience.
## Quick Reference
- Load non-critical CSS and JS asynchronously using `defer`, `async`, or media queries
- Inline critical CSS to allow the page to start rendering immediately
- Avoid `@import` in CSS as it creates serial request chains
## Check
Review the page's resources and identify any CSS or JavaScript files that are blocking the initial render of the page.
