Cloudflare Core Web Vitals Guide
Leverage edge features to achieve maximum performance and user interaction scores.
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Cloudflare Core Web Vitals Optimization Guide
Core Web Vitals measure real-world user experience (LCP, INP, CLS). By leveraging Cloudflare Polish, enabling HTTP/3 Early Hints, and serving modern WebP image assets directly from the edge, you can improve page speed scores instantly.
1. Accelerating LCP with Polish & WebP Resizing
Largest Contentful Paint (LCP) is highly dependent on heavy banner images. Enabling **Cloudflare Polish** automatically compresses image files and converts them into the modern WebP or AVIF format on-the-fly, serving lightweight payloads to browsers.
Compress and optimize raw image assets using our:
2. Early Hints & Critical Asset Preloading
**Early Hints** allow Cloudflare to send 103 status headers to browsers while the origin server is still processing HTML. This instructs browsers to preload critical stylesheets and fonts, eliminating load delays.
Run a complete speed diagnostics audit to locate critical resources using our:
Web Vitals Checklist
Enable Early Hints
Turn on 103 Early Hints in the Speed panel to prepare client browsers for critical assets.
Configure Brotli & TCP Turbo
Activate compression and optimization rules at the edge proxy level to accelerate asset delivery times.
Leverage Polish & Mirage
Turn on image payload resizing to reduce mobile page weight and eliminate dynamic shift (CLS).
Official Performance Documentation
For official documentation regarding Cloudflare image resizing and speed rules:
Performance Tools
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