SkillsAdd

thedaviddias/front-end-checklist

third-party-scripts

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.

First seen Jun 8, 2026

Installation

$ npx skills add thedaviddias/front-end-checklist --skill third-party-scripts
View on skills.sh ↗ GitHub repository ↗

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Also in this package

Other skills from thedaviddias/front-end-checklist · top by installs.

npx skills add thedaviddias/front-end-checklist
frontend-checklist-global 96 color-contrast 22 animation-performance 22 https 19 pdf-size 18 word-count 18 image-optimization 18 cumulative-layout-shift 18 mobile-testing 18 quality 17

Browse all from thedaviddias/front-end-checklist

More details

Agent compatibility

Declared targets from SKILL.md / docs. Unmarked agents are not listed — the skill may still install via the CLI.

Claude Code Not declared
Cursor Not declared
Codex Not declared
GitHub Copilot Not declared
Windsurf Not declared
Gemini CLI Not declared
Cline Not declared
OpenCode Not declared

Repository health

Stars 74.1K
License MIT
Default branch main
Open issues 5
Status Active

Skill metadata

Parsed from SKILL.md frontmatter.

More metadata
category
performance
priority
high
difficulty
intermediate
estimatedTime
20
source
frontendchecklist.io
url
https://frontendchecklist.io/en/rules/performance/third-party-scripts

Package contents

Files included with this skill beyond the listing page.

  • skill md SKILL.md 1,675 B
  • docs SUMMARY.md 240 B

History

  1. First seen on skills.sh
  2. First recorded snapshot · 9 installs

SKILL.md

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.

Fix

Add async or defer attributes to third-party scripts and consider lazy loading non-critical scripts.

Explain

Explain the performance impact of third-party scripts and strategies to minimize their blocking effect.

Code Review

Review the routes, assets, and loading behavior that affect Optimize third-party script loading. Flag exact files, requests, or rendering steps that add unnecessary network, CPU, or layout cost, and describe the measurement method used to confirm the issue.

For full implementation details, code examples, and framework-specific guidance, see references/rule.md.

Rule page: https://frontendchecklist.io/en/rules/performance/third-party-scripts