Friday, January 21, 2011

best practices for making web pages fast


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

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