Make the web
blazingly fast

A comprehensive guide to frontend web performance — metrics, techniques, checklists, and interactive demos.

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Executive Summary
A high-level overview of the modern web performance landscape and key strategies.
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20 Quick Wins: Low-Hanging Performance Fruit
Twenty low-effort, high-impact changes you can ship today for instant speed gains.
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Comprehensive Performance Checklist
A comprehensive audit checklist to ensure nothing slips through the cracks.
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1. Performance Culture & Planning
Build organizational buy-in and a roadmap that makes speed a lasting priority.
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2. Core Web Vitals & Modern Metrics
Understand LCP, INP, and CLS — the metrics that define real-world user experience.
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3. Performance Budgets & Real User Monitoring
Set measurable speed targets and track them with real user data.
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4. Modern Build Tools
Leverage Vite, Rolldown, and Rust-powered toolchains for blazing-fast builds.
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5. Code Splitting, Tree Shaking & Bundle Optimization
Ship only the code each page needs through intelligent splitting and dead-code elimination.
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6. JavaScript Execution & Runtime Performance
Minimize main-thread work, tame long tasks, and keep interactions snappy.
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7. Differential Serving & Legacy Code
Serve modern bundles to modern browsers and lighter polyfills to the rest.
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8. Rendering Strategies Overview
Choose between SSR, SSG, ISR, and streaming to match your content's update cadence.
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9. React 19 & Server Components
Unlock zero-bundle server components and streaming SSR with React's latest architecture.
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10. React Performance Patterns & State Management
Prevent unnecessary re-renders with memoization, selectors, and surgical state updates.
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11. Alternative Frameworks & Their Performance Models
Compare Astro, Svelte, Solid, and Qwik's approaches to shipping less JavaScript.
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12. Image Optimization
Deliver crisp visuals at a fraction of the bytes with modern formats and responsive sizing.
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13. CSS Optimization
Eliminate render-blocking stylesheets with critical CSS, containment, and efficient selectors.
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14. Modern CSS Replacing JavaScript
Replace animation libraries and layout JS with native CSS features browsers now support.
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15. Font Loading & Optimization
Prevent layout shift and invisible text with smart font-display, subsetting, and preloading.
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16. Third-Party Script Management
Audit, defer, and sandbox third-party tags before they tank your page speed.
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17. Resource Hints & Prefetching
Tell the browser what to fetch next with preload, prefetch, and speculation rules.
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18. Network Protocols & Compression
Adopt HTTP/3, QUIC, and Zstandard compression for faster, more reliable transfers.
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19. Edge Computing, CDNs & Caching
Move compute closer to users with edge functions, smart caching, and global CDN strategies.
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20. Testing, Monitoring & Debugging
Catch regressions early with lab testing, synthetic monitors, and performance profiling.
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21. Security & Performance
Balance robust security headers and CSP policies with HTTPS without sacrificing speed.
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22. Accessibility & Developer Experience
Ship fast sites that work for everyone while keeping your team productive and happy.
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