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Found 36 Skills
Load non-critical resources when a user interacts with UI requiring it.
Guard serialization and canvas-render pipeline performance against regressions. Use when modifying serializeTimelineDirect.ts or any hot path in the foreignObject/native render pipeline to ensure changes don't increase p95 frame-capture time.
Use when loading all data upfront. Use when initial page load is slow. Use when fetching data that might not be needed.
Performance optimization patterns for Mapbox GL JS web applications. Covers initialization waterfalls, bundle size, rendering performance, memory management, and web optimization. Prioritized by impact on user experience.
Conducts comprehensive Magento 2 performance analysis and optimization. Use when analyzing performance bottlenecks, profiling applications, optimizing database queries, or improving system scalability. Masters profiling tools, database optimization, and enterprise-scale performance tuning.
Implement Real User Monitoring (RUM) to capture actual user performance data including Core Web Vitals and page load times. Use when setting up user experience monitoring or tracking custom performance events. Trigger with phrases like "setup RUM", "track Core Web Vitals", or "monitor real user performance".
Prioritized TypeScript React code review guidelines. Focuses on type safety, React conventions, performance, security, architecture, accessibility, error handling, and testing. First scan the code to identify issues, then obtain solutions and review comment templates from the references/ directory.
Use this skill when optimizing Core Web Vitals - LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift). Triggers on page speed optimization, Lighthouse score improvement, fixing layout shifts, improving responsiveness, setting up performance monitoring with CrUX or RUM, and framework-specific CWV fixes for Next.js, Nuxt, Astro, and Remix.
Performance review and testing: evaluate Core Web Vitals, page load times, bundle sizes, runtime performance, resource optimization, and rendering efficiency with browser-based measurement and benchmarking.
Use when designing or building modern web applications in JavaScript/TypeScript (SPA/SSR/SSG/ISR/RSC): architecture trade-offs, state/data patterns, performance, testing, delivery, and team scaling.
Optimize rendering of large lists by only displaying items visible in the viewport (windowing).
React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements.