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third-party-scripts

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Use when auditing slow page loads, heavy assets, or rendering delays related to Optimize third-party script loading. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.

skills/third-party-scripts/SKILL.md

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# Optimize third-party script loading

Third-party scripts are the #1 cause of slow websites—unoptimized loading can add 2-5 seconds to your page load time.

## Quick Reference

- Use async for independent scripts (analytics, ads)
- Use defer for DOM-dependent scripts (chat widgets, social)
- Lazy-load non-critical scripts after page load
- Consider self-hosting critical third-party scripts

## Check

Analyze third-party scripts on this page to ensure they use async/defer and don't block rendering.