Performance Budget Lab
Use for website performance planning, Lighthouse/web-vitals checks, bundle/media/font budgets, Core Web Vitals triage, image/video optimization, animation performance, deployment readiness, and premium-site speed audits.
Install
$ agentstack add skill-thegoat395-codex-skills-performance-budget-lab ✓ scanned · ✓ verified — works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
About
Performance Budget Lab
Use this skill to keep visually rich sites fast.
Budget Areas
- JavaScript bundle size
- route-level code splitting
- image dimensions, formats, and lazy loading
- video poster, preload, autoplay, and reduced-data behavior
- font loading and fallback metrics
- animation cost and scroll handlers
- layout shift sources
- server rendering/static rendering choices
- caching and CDN behavior
Workflow
- Identify stack and deployment target.
- Inspect package dependencies and route structure.
- Run available build/lint/test commands.
- Run Lighthouse or browser performance checks when feasible.
- Check Core Web Vitals risks: LCP, CLS, INP, TTFB.
- Optimize media before adding more JS.
- Prefer CSS and Motion for small interactions; reserve GSAP/R3F/video for clear value.
- Report tradeoffs honestly when visual richness costs performance.
Output
Give:
- current risks
- recommended budgets
- concrete fixes
- commands run
- remaining uncertainty
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: TheGoat395
- Source: TheGoat395/Codex-Skills
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.