How do I install the Third Party Scripts skill?

Run npx skillmds@latest add thedaviddias/third-party-scripts in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Third Party Scripts safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Third Party Scripts?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Third Party Scripts free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Third Party Scripts?

thedaviddias (@thedaviddias) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Third Party Scripts by thedaviddias

Name: Third Party Scripts
Author: thedaviddias

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.

thedaviddias 782ff06 2 files · 7.5 KB Updated Sep 17, 2026

File contents

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

Frequently asked questions