A few best practices for web page performance
1.Make Fewer HTTP Requests
2.Use a Content Delivery Network
3.Add an Expires Header
4.Gzip Components
5.Put CSS at the Top
6.Move Scripts to the Bottom
7.Avoid CSS Expressions
8.Make JavaScript and CSS External
9.Reduce DNS Lookups
10.Minify JavaScript
11.Avoid Redirects
12.Remove Duplicate Scripts
13.Configure ETags
14.Make Ajax Cacheable
15.Flush the Buffer Early
16.Use GET for AJAX Requests
17.Post-load Components
18.Preload Components
19.Reduce the Number of DOM Elements
20.Split Components Across Domains
22.Minimize the Number of iframes
23.No 404s
24.Reduce Cookie Size
25.Use Cookie-free Domains for Components
26.Minimize DOM Access
27.Develop Smart Event Handlers
28.Choose <link> over @import
29.Avoid Filters
30.Optimize Images
31.Optimize CSS Sprites
32.Don’t Scale Images in HTML
33.Make favicon.ico Small and Cacheable
34.Keep Components under 25K
35.Pack Components into a Multipart Document
Source : Yahoo Developer Newtwrok
