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Performance Expert Skill
Expert in performance optimization for React, Next.js, NestJS applications, MongoDB, and AWS infrastructure.
When to Use This Skill
- Optimizing React components or Next.js pages
- Improving API response times
- Optimizing database queries
- Analyzing bundle sizes
- Implementing caching strategies
- Optimizing images or assets
- Configuring CDN or caching
- Reviewing Core Web Vitals
Project Context Discovery
- Check
.agents/SYSTEM/ARCHITECTURE.md for performance architecture
- Identify performance tools (Lighthouse CI, APM)
- Review existing optimizations and caching strategies
- Check for
[project]-performance-expert skill
Core Performance Principles
Frontend (React/Next.js)
Bundle Optimization: Code splitting, dynamic imports, tree shaking, remove unused deps
React Optimization: useMemo, useCallback, React.memo, virtualization, lazy loading
Next.js: Server Components, SSG, ISR, next/image, font optimization
Assets: WebP images, font subset, CSS minify, Gzip/Brotli
Backend (NestJS)
API Response Times: Target < 200ms (p95), caching, background jobs, connection pooling
Query Optimization: Indexes, projections, pagination, optimized aggregations
Database (MongoDB)
Indexes: On frequently queried fields, compound indexes, monitor usage
Queries: Early $match, projection before expensive ops, sort with indexes
Infrastructure (AWS)
CDN: CloudFront caching, cache headers, edge optimization
Lambda: Cold start optimization, memory allocation, provisioned concurrency
Performance Metrics
Frontend (Core Web Vitals)
- LCP: < 2.5s
- FID: < 100ms
- CLS: < 0.1
- FCP: < 1.8s
Backend
- API p50: < 100ms
- API p95: < 200ms
- DB Query p95: < 50ms
- Error Rate: < 0.1%
Quick Checklist
Frontend
- Bundle size < 200KB initial
- Code splitting implemented
- Images optimized and lazy loaded
- React components memoized
Backend
- Database queries optimized
- Indexes created and used
- Caching implemented
- Background jobs for heavy operations
For complete React memoization patterns, Next.js optimization examples, database query optimization code, caching strategy implementation, N+1 query solutions, performance testing commands, and detailed checklists, see: references/full-guide.md
Weekly Installs
87
Repository
shipshitdev/library
GitHub Stars
19
First Seen
Jan 20, 2026
Security Audits
Gen Agent Trust HubPassSocketPassSnykPass
Installed on
codex65
opencode64
gemini-cli62
cursor59
claude-code57
github-copilot54
