Best Practices for Speeding Up Your Web Site

Minimize HTTP Requests

Use a Content Delivery Network

Add an Expires or a Cache-Control Header

Gzip Components

Put Stylesheets at the Top

Put Scripts at the Bottom

Avoid CSS Expressions

Make JavaScript and CSS External

Reduce DNS Lookups

Minify JavaScript and CSS

Avoid Redirects

Remove Duplicate Scripts

Configure ETags

Make Ajax Cacheable

Flush the Buffer Early

Use GET for AJAX Requests

Post-load Components

Preload Components

Reduce the Number of DOM Elements

Split Components Across Domains

Minimize the Number of iframes

No 404s

Reduce Cookie Size

Use Cookie-free Domains for Components

Minimize DOM Access

Develop Smart Event Handlers

Choose <link> over @import

Avoid Filters

Optimize Images

Optimize CSS Sprites

Don’t Scale Images in HTML

Make favicon.ico Small and Cacheable

Keep Components under 25K

Pack Components into a Multipart Document

Avoid Empty Image src