Every 100ms improvement in LCP correlates with 1.2% conversion increase.
2026 Targets
- LCP: Under 2.5s (ideally 1.8s)
- INP: Under 200ms
- CLS: Under 0.1
The Playbook
1. Server-Side Rendering with Next.js
Cuts LCP by 40-60%.
2. Image Optimisation
Use next/image for automatic WebP/AVIF. Zero images above 100KB.
3. Font Loading
next/font eliminates layout shift.
4. Bundle Optimisation
Code-split per route, tree-shake, lazy-load heavy components.
5. Edge Deployment
Vercel/Cloudflare for sub-50ms latency from NZ edge nodes.
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