Lesson 22 / 25
Advanced performance techniques
Explore advanced patterns and techniques for extreme performance optimization.
WebAssembly for performance-critical code
Compile C++, Rust to WebAssembly for 10-50x speedup on compute-heavy tasks (image processing, 3D). Compile once, run across browsers. Ideal for math, physics, data processing. Typical WASM module: 30-100KB gzipped.
Server-side rendering and static generation
SSR: render on server, send HTML+data. Faster FCP than client-side. SSG: pre-render at build time, serve static HTML. Best for content sites. ISR (Incremental Static Regeneration) updates static pages on-demand without full rebuild.
Choosing optimization techniques
Profile first, optimize second. Not all optimizations help all sites. SSR helps FCP, may hurt TTI. WASM helps computation, not layout. Choose based on measurements, not assumptions.
Quick check
Quick check: What does WebAssembly help optimize?
- Compute-heavy tasks for 10-50x speedup
- All JavaScript code
- Layout rendering