Mastering Performance in Progressive Web Apps (PWAs)

Core features: responsiveness, offline support, app-like feel, and installability.

Understanding load time vs runtime performance, core web vitals, and user perception.

Real-world case studies showing conversion gains and user retention.

Push, Render, Pre-cache, Lazy-load—how this technique boosts app loading speed.

Strategies for implementing PRPL with React (Code Splitting), Angular (Lazy Routes), or Vue.

Use Workbox to pre-cache shell, lazy-load views, and cache fallback.

Response, Animation, Idle, Load—optimizing each user experience phase.

Keep response under 100ms, animation frames under 16ms.

Use requestIdleCallback, dynamic imports, and defer non-essential tasks.

LCP, FID, CLS, TTI, TBT—what they mean and their impact on UX.

Difference between real-user monitoring (RUM) and synthetic tests.

Use Web Vitals JS library, Google Analytics, and PageSpeed Insights.

Run audits via DevTools, CLI, or CI. Analyze reports for PWA compliance and performance.

Understand Opportunities, Diagnostics, and Best Practices tabs.

Integrate Lighthouse in GitHub Actions or your CI pipeline to enforce thresholds.

Use waterfall charts, throttling, and screenshots to identify slow assets.

Find long tasks, memory leaks, and unused JS/CSS.

Use FPS meter, layout shifts, and paint events to fine-tune interactions.