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Nextjs optimization

Skill FilippoDeSilva/skills/skills/nextjs/nextjs-optimization

Skills for my agentic development workflow.

Install
npx -y skills add FilippoDeSilva/skills --skill nextjs-optimization

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

2 things to look at

  • no licenseNo license file was found in the repository. Code published without one is not open source by default, so using it at work is a question for whoever answers licensing questions where you are.
  • 2 stars2 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.

What its author says it does

Copied from the file, not written here

Optimize images, fonts, scripts, and metadata for Next.js performance and Core Web Vitals. Use when configuring next/image for LCP, next/font for zero layout shift, next/script loading strategies, or generateMetadata for SEO.

The file declares its own license as MIT. That is the author’s claim about this one file, and it is not the same thing as the license GitHub reports for the repository, which is listed with the other numbers below.

SKILL.md

2.3 KB, 414 tokens by cl100k_base, as published. Nobody here has run it

Optimization

Priority: P1 (HIGH)

Core optimization primitives provided by Next.js. Monitor First, Optimize Later.

Monitoring (Core Web Vitals)

  • LCP (Largest Contentful Paint): Target < 2.5s.
  • CLS (Cumulative Layout Shift): Target < 0.1.
  • INP (Interaction to Next Paint): Target < 200ms.
  • Tools: Chrome DevTools "Performance" tab, next/speed-insights, React Profiler.

Images

Always use next/image to prevent CLS and enable automatic optimization:

See implementation examples

Fonts

Use next/font for zero layout shift — self-hosts fonts and adds font-display: swap:

See implementation examples

Metadata (SEO)

See implementation examples

Scripts

Use next/script with appropriate loading strategies:

  • beforeInteractive: Critical scripts (polyfills).
  • afterInteractive: Analytics (Google Analytics).
  • lazyOnload: Chat widgets, social embeds.

Bundle & Components

  • Analyze with @next/bundle-analyzer. Prune heavy libraries; use ESM-tree-shakable dependencies.
  • Use dynamic imports with Suspense for large components not needed at initial render.
  • Enable ppr: true (Partial Prerendering) in Next.js 15+ for static shell + dynamic islands.

Anti-Patterns

  • No <img> tag: Use next/image to prevent CLS and enable automatic optimization.
  • No Google Fonts CDN link: Use next/font to self-host and eliminate layout shift.
  • No metadata in _document.tsx: Use export const metadata or generateMetadata().
  • No 3rd-party scripts in <head>: Use next/script with appropriate strategy.

Keep looking

Skills are one crate of 328,083. Ordering is by how many stacks a row turns up in, so the top of any crate is what has actually been picked rather than what has the most stars.