Audit Speed
Audit-speed performs deep Core Web Vitals and page speed analysis to diagnose performance issues like slow LCP, CLS, INP, and high Lighthouse scores. It's designed for web developers, SEO professionals, and site owners who need to understand why pages are slow and receive root-cause analysis with specific optimization recommendations. The skill solves performance bottleneck identification by providing structured diagnostic trees for each metric and actionable fixes based on technical stack and constraints.
- skills.sh installs
- 2.4K
- GitHub stars
- 21
- last updated
- Aug 21, 2026
Install
$ npx -y skills add calm-north/seojuice-skills --skill audit-speed --agent claude-codeInstalls into .claude/skills of the current project.
Files
Audit Speed
Deep Core Web Vitals audit with root-cause analysis trees and resource optimization recommendations.
Core Web Vitals Thresholds
| Metric | Good | Needs Improvement | Poor |
|---|---|---|---|
| LCP (Largest Contentful Paint) | < 2.5s | 2.5s - 4.0s | > 4.0s |
| CLS (Cumulative Layout Shift) | < 0.1 | 0.1 - 0.25 | > 0.25 |
| INP (Interaction to Next Paint) | < 200ms | 200ms - 500ms | > 500ms |
| FCP (First Contentful Paint) | < 1.8s | 1.8s - 3.0s | > 3.0s |
| TTFB (Time to First Byte) | < 800ms | 800ms - 1800ms | > 1800ms |
Before You Start
Gather this context:
- Which pages? Homepage, key landing pages, or specific slow pages.
- Current scores. If the user has Lighthouse or PageSpeed Insights data, start there.
- Tech stack. CMS, framework, hosting — this determines which optimizations are available.
- Known constraints. Third-party scripts they can't remove, design requirements that limit optimization.
If no data is available, suggest running Google PageSpeed Insights on the key URLs.
LCP Root-Cause Tree
LCP measures when the largest visible element finishes rendering. Diagnose:
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- Repository
- github.com/calm-north/seojuice-skills
- Categories
- Debugging, Marketing & SEO
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