Yahoo! developer network summarized other rules, and built some into YSlow
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
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