How to speed up Largest Contentful Paint (LCP) with cross-site prefetching
summary
Two cross-site prefetch methods aim to speed Largest Contentful Paint: Private Prefetch Proxy encrypts requests through a proxy that hides IPs and omits cookies, while Signed Exchanges let referrers serve cryptographically signed cached pages. Google Search uses the proxy for Chrome on Android and Cloudflare enables SXG with one click for over 12,000 sites. Prefetching main HTML boosts the fraction of loads with good LCP by 14 percentage points; Narcity reports 41% LCP improvement, Paper Magazine 27% more sessions per user, MLT Blog 21% faster loads.
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chapters (9)
- 0:00Introduction to prefetching
- 0:28Impact on user metrics
- 1:18How prefetching works
- 2:25Cross-site prefetching basics
- 3:46Implementation considerations
- 5:24Prefetch technologies
- 6:18Private prefetch proxy
- 8:07Signed exchanges
- 10:35Results and conclusion
