Phase 6 — JavaScript Performance
Phase 6 — JavaScript Performance
Section titled “Phase 6 — JavaScript Performance”Introduction
Section titled “Introduction”Performance is critical for user experience. This phase covers browser rendering (repaint, reflow), the Performance API for measuring code, memory optimization, lazy loading, tree shaking, and bundle optimization techniques.
Learning Objectives
Section titled “Learning Objectives”- Understand browser rendering pipeline (repaint, reflow)
- Use the Performance API to measure and optimize code
- Implement lazy loading for images and components
- Understand tree shaking and code splitting
Topics Covered
Section titled “Topics Covered”| Topic | Description |
|---|---|
| Rendering | Browser rendering pipeline |
| Repaint | Visual changes without layout |
| Reflow | Layout recalculation (expensive) |
| Performance API | Measuring code execution time |
| Memory Optimization | Reducing memory footprint |
| Lazy Loading | Deferring non-critical resources |
| Tree Shaking | Eliminating unused code |
| Bundle Optimization | Reducing bundle size |
| Code Splitting | Splitting bundles by routes/usage |
Learning Path
Section titled “Learning Path”Rendering → Repaint → Reflow → Performance API → Memory Optimization → Lazy Loading → Tree Shaking → Bundle Optimization → Code SplittingEstimated Learning Time
Section titled “Estimated Learning Time”3–4 hours
Related Topics
Section titled “Related Topics”- Phase 3 — Async JavaScript
- Phase 4 — Browser APIs
- Phase 8 — JavaScript Internals