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SKILL verified MIT Self-run

Perf Budget

skill-m-binimran-dev-pack-perf-budget · by m-binimran

Enforce a Core Web Vitals / Lighthouse performance budget on a Next.js site — LCP, CLS, INP, bundle size, images. Use before shipping a page or when a page feels slow.

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Install

$ agentstack add skill-m-binimran-dev-pack-perf-budget

✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.

Security review

✓ Passed

No 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.

View the full security report →

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Reliability & compatibility

✓ Security review passed
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Declared compatibility

Claude CodeClaude Desktop

Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

Preview Execution monitoring

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About

perf-budget

The budget

  • LCP < 2.5s · CLS < 0.1 · INP < 200ms (the three Core Web Vitals).
  • JS shipped to the client kept lean; flag large client bundles.

Checks & fixes

  • Images: use next/image (lazy, sized, modern formats). Set width/height to reserve space → fixes CLS.
  • Fonts: next/font (self-hosted, display: swap) — no layout shift, no render-block.
  • Client JS: prefer Server Components; "use client" only where needed. dynamic() import heavy/below-fold

components. Watch big date/icon/chart libs.

  • LCP element: make the hero image/text fast — priority on the LCP image, no blocking work above it.
  • Caching: static where possible; sensible revalidate.

Measure, don't guess

  • Run Lighthouse / next build and read the real numbers. Report measured values against the budget.
  • If you can't measure in this environment, say the budget is "designed for" not "verified."

Output

  • Each metric: target vs. measured (or "unmeasured"), and the fix for any miss.

Guardrails

  • Don't claim a CWV pass without a real measurement.
  • Don't ship a render-blocking third-party script without justifying it.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.

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