𝗢𝗽𝘁𝗶𝗺𝗶𝘇𝗶𝗻𝗴 𝗖𝗼𝗿𝗲 𝗪𝗲𝗯 𝗩𝗶𝘁𝗮𝗹𝘀 𝗨𝘀𝗶𝗻𝗴 𝗖𝗗𝗡 𝗮𝗻𝗱 𝗖𝗮𝗰𝗵𝗶𝗻𝗴 𝗛𝗲𝗮𝗱𝗲𝗿𝘀

Google uses Core Web Vitals to measure your site speed and stability. High scores improve your SEO and user experience.

You need to track three main metrics: • Largest Contentful Paint (LCP): Target under 2.5 seconds. • Interaction to Next Paint (INP): Target under 200ms. • Cumulative Layout Shift (CLS): Target under 0.1.

A Content Delivery Network (CDN) paired with smart caching headers is the fastest way to improve these scores.

How a CDN helps:

  • It reduces latency by serving files from locations near your users.
  • It caches API responses at the edge to protect your server.
  • It serves stale content if your origin server goes down.
  • It optimizes images by resizing and compressing them automatically.

Use these caching strategies: • Static assets: Use long cache durations with file hashes. • HTML pages: Set specific cache headers based on your update frequency. • API responses: Cache content at the edge to reduce origin load.

Image optimization is vital for LCP. Most LCP issues come from large hero images. A CDN can convert these to WebP or AVIF formats and serve them from the closest server. This reduces mobile page weight by up to 70%.

Managing updates is easy with modern tools. Use webhooks to trigger cache purging. When you update content, your CDN removes only the old data. This keeps your site fast without showing outdated information.

Steps to take:

  • Use a modern CDN with edge computing.
  • Set correct cache-control headers for every resource type.
  • Optimize images at the edge.
  • Cache API responses.
  • Use webhooks to clear cache during updates.
  • Monitor real user metrics to see your progress.

Small changes in how you serve files lead to better rankings and more conversions.

Source: https://dev.to/sohanaakbar7/optimizing-core-web-vitals-using-cdn-caching-headers-2lfd