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Google Tag Manager Performance Audit

Audits how Google Tag Manager slows a page and suggests measured fixes

Source Download skill
Repository
thedaviddias/Front-End-Checklist
Stars
74,632
Licence
MIT
Files
2 files

What it does

When installed, the agent reviews a website's Google Tag Manager setup for performance problems such as blocking scripts, too many tags, and heavy page weight. It is instructed to confirm the real bottleneck using DevTools, Lighthouse, or field data before recommending changes, then suggests fixes like removing unused tags, loading asynchronously, or moving to server-side GTM.

Great for

  • Front-end developers investigating slow page loads on sites that use Google Tag Manager
  • Marketers or site owners who want to understand how their tracking tags affect speed
  • Teams planning whether to move tracking to a server-side GTM setup

Skip it if

  • Sites that do not use Google Tag Manager, since the guidance is specific to it
  • Anyone expecting a tool that edits live tag containers automatically; the skill gives advice and review, not account changes, and may cause tracking loss if fixes are applied without checking analytics needs

Try asking

  • “Audit my GTM setup for slow page loads and tell me which tags to remove first”
  • “Review this page's network waterfall and check whether Google Tag Manager is blocking rendering”
  • “Explain the trade-off between tracking coverage and speed for our GTM container”
  • “Should we move our GTM implementation to server-side? Measure the impact first”
Step-by-step guide: how to use Google Tag Manager Performance AuditInstall, first run, examples, tips and FAQs

Install in 3 steps

  1. 1

    Download the skill

    The ZIP contains the 2 original files, the MIT licence and an attribution note.

    gtm-present.zip
  2. 2

    Add it to your agent

    Claude Code (all projects)

    mkdir -p ~/.claude/skills && unzip gtm-present.zip -d ~/.claude/skills/

    Claude Code / Agent SDK (this project only)

    mkdir -p .claude/skills && unzip gtm-present.zip -d .claude/skills/

    Claude apps (web/desktop): Settings → Capabilities → Skills → Upload skill, and choose the ZIP.

  3. 3

    Ask for the task

    No special command needed — the agent reads the skill's description and loads it when your request matches. Try one of the prompts above.

Get better results

  • Provide Lighthouse output, a DevTools performance trace, or field data so the agent can verify the bottleneck instead of guessing
  • Share the GTM container export or the page HTML so the review can reference exact tags and triggers
  • Check the referenced rule page for framework-specific detail, since the skill file itself is brief

What's inside

  • references/rule.md
  • SKILL.md

Redistributed unmodified from thedaviddias/Front-End-Checklist under the MIT licence. The assessment was drafted with AI from the skill's files on 2026-10-29. Skills can instruct your agent to run code — read SKILL.md and any scripts before installing.