The Problem
Our EdTech platform served 1M+ learners, but pages were slow. LCP exceeded 4 seconds on mobile. CLS was bouncing around due to late-loading ads and images. Users were dropping off.
The Strategy
1. Server-Side Rendering with Incremental Static Regeneration
We moved from pure CSR to a hybrid approach. Most pages became statically generated with incremental regeneration. Product pages refreshed every 6 hours. Dashboard content stayed server-rendered.
2. Image Optimization Pipeline
Every image went through Next.js Image Component optimization. WebP format, responsive sizing, lazy loading below the fold, and proper aspect ratios to eliminate CLS.
3. Code Splitting at the Route Level
Large bundles got split aggressively. Chart libraries, rich text editors, and admin panels loaded only when accessed. Dynamic imports with proper loading states.
4. Font Loading Strategy
Self-hosted fonts with `font-display: swap`. Preconnect to CDN origins. Eliminated render-blocking font requests.
The Results
Key Takeaway
Performance optimization isn't about one magic fix. It's a systematic approach to every asset, every request, and every millisecond of render time.