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Performance

Core Web Vitals, Lazy Loading, Code Splitting und Bundle-Analyse.

Was ist Performance?

Dieses Skill bietet eine Sammlung von Regeln und Best Practices zur Optimierung der Web-Performance, mit besonderem Fokus auf Core Web Vitals (LCP, INP, CLS), Lazy Loading und Code Splitting. Es unterstützt moderne Frameworks wie React (React.lazy()) und Next.js (next/dynamic, next/image) und enthält Anleitungen zur Bundle-Analyse mit @next/bundle-analyzer sowie zur Bildoptimierung (WebP/AVIF). Entwickler profitieren von konkreten Maßnahmen zur Reduzierung von Ladezeiten und Layout-Verschiebungen, einschließlich Caching-Strategien (HTTP-Header, Service Worker, stale-while-revalidate) und Datenbankoptimierung (Indexierung, EXPLAIN ANALYZE). Das Skill ist ideal für Teams, die metrikbasierte Performance-Verbesserungen in ihre CI/CD-Pipeline integrieren möchten.

Funktioniert mit~Claude Code~Codex CLI~Cursor
npx skills add https://github.com/YepAPI/skills/tree/HEAD/skills/performance
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Dokumentation

Was macht Performance?

Regeln

  • Core Web Vitals: LCP < 2,5s, INP < 200ms, CLS < 0,1
  • Lazy Load von Bildern unterhalb der Seitenfalte und schweren Komponenten: React.lazy(), next/dynamic
  • Code-Splitting von Routen – jede Seite lädt nur ihren eigenen Code
  • Bilder optimieren: WebP/AVIF-Format, korrekte Größen, next/image mit sizes
  • Bundle-Analyse: @next/bundle-analyzer – große Abhängigkeiten identifizieren
  • Caching: HTTP-Cache-Header, Service Worker für wiederholte Besuche, stale-while-revalidate
  • Datenbank: Indizes für häufig abgefragte Spalten, mit EXPLAIN ANALYZE langsame Abfragen finden
  • Layout-Verschiebungen vermeiden: explizite Dimensionen für Bilder, Videos, Einbettungen festlegen

Individual skills in this repo

This repo contains 20 individual skills — each has its own dedicated page.

YepAPI/skills

WCAG 2.1 AA — semantic HTML, keyboard navigation, screen readers.

YepAPI/skills

Experiment setup, variant splitting, statistical significance, and feature flag integration.

YepAPI/skills

CRUD generators, data tables, user management, role-based access, and bulk operations.

YepAPI/skills

Monitor what ChatGPT and Gemini say about your brand using YepAPI.

YepAPI/skills

Queue workers with BullMQ/Inngest/Trigger.dev, job retries, dead letter queues, concurrency.

YepAPI/skills

Commander.js, interactive prompts with Clack, spinners, colors, config files, exit codes, and npm publishing.

YepAPI/skills

cmdk integration, Cmd+K trigger, fuzzy search, grouped actions, keyboard navigation, and dynamic action registration.

YepAPI/skills

Content planning with trend and sentiment data from YepAPI.

YepAPI/skills

Content calendar, keyword-driven planning, and content briefs.

YepAPI/skills

Theme switching with CSS variables, system preference detection, next-themes, and persistence.

YepAPI/skills

Threaded comments, @mentions, reactions, moderation queue, optimistic UI, and cursor pagination.

YepAPI/skills

Competitive analysis between domains using YepAPI.

YepAPI/skills

Layout grids, KPI cards, data tables with sorting/filtering, sidebar navigation, and responsive breakpoints.

YepAPI/skills

Data encryption — TLS everywhere, AES-256-GCM for PII, bcrypt passwords, encrypted backups.

YepAPI/skills

Chart patterns with Recharts/Nivo/D3, responsive containers, color scales, and accessibility.

YepAPI/skills

Drizzle schema definition, push vs migrate, type-safe queries, relations, transactions, and prepared statements.

YepAPI/skills

Upload handling, resize/compress, CDN delivery, blur placeholders, and next/image patterns.

YepAPI/skills

Local business and Google Maps research using YepAPI.

YepAPI/skills

Cursor-based pagination, IntersectionObserver, virtualized lists with @tanstack/react-virtual, and scroll position restoration.

YepAPI/skills

Chat UI components, streaming responses with AI SDK, context window management, and RAG patterns.

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steipete/oracle

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steipete/peekaboo

Capture and automate macOS UI with the Peekaboo CLI.

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mattpocock/design-an-interface

Generate multiple radically different interface designs for a module using parallel sub-agents. Use when user wants to design an API, explore interface options, compare module shapes, or mentions "design it twice".

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mattpocock/prototype

Build a throwaway prototype to flesh out a design — a runnable terminal app for state/business-logic questions, or several radically different UI variations toggleable from one route.

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mattpocock/grill-me

Interview the user relentlessly about a plan or design until reaching shared understanding, resolving each branch of the decision tree. Use when user wants to stress-test a plan, get grilled on their design, or mentions "grill me".

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