Caching
Definition
Temporarily storing website data so it loads faster on repeat visits. Browser caching, server caching, and CDN caching all speed up your site.
What is Caching?
Caching is storing copies of data so future requests can be served faster. Instead of fetching everything fresh each time, cached data is delivered instantly.
Types of Caching
Browser Caching
Your browser stores files locally. When you revisit a site, some files load from your computer instead of downloading again.
Server Caching
The server stores pre-built pages instead of generating them from scratch for each visitor.
CDN Caching
Content delivery networks store your static files on their global servers.
Database Caching
Frequently-used database queries are stored for quick retrieval.
Why Caching Matters
Speed
Cached content loads almost instantly. No waiting for server processing or downloads.
Server Load
Less work for your server means it can handle more visitors.
User Experience
Fast sites keep visitors happy and improve conversions.
SEO
Page speed affects rankings. Caching improves Core Web Vitals.
Caching Considerations
Cache Expiry
Cached content can become outdated. Set appropriate expiry times.
Cache Invalidation
When you update content, old cached versions need clearing.
What Not to Cache
Dynamic content (logged-in users, shopping carts) shouldn't be cached.
Implementing Caching
Most modern hosting and CMS platforms handle caching automatically. You can add plugins (like WP Super Cache for WordPress) or CDN services (like Cloudflare) for more control.
For custom sites, proper cache headers in server configuration control browser caching.
Testing Cache
Use browser developer tools (Network tab) to see which resources are cached. PageSpeed Insights will flag caching issues.