網站最佳化–加快頁面載入速度(一)

《Best Practices for Speeding Up Your Web Site》定義的34條規則：

1.    Make Fewer HTTP Requests
2.    Use a Content Delivery Network
3.    Add an Expires or a Cache-Control Header
4.    Gzip Components
5.    Put Stylesheets at the Top
6.    Put Scripts at the Bottom
7.    Avoid CSS Expressions
8.    Make JavaScript and CSS External
9.    Reduce DNS Lookups
10.   Minify JavaScript and CSS
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
21.   Minimize the Number of iframes
22.   No 404s
23.   Reduce Cookie Size
24.   Use Cookie-free Domains for Components
25.   Minimize DOM Access
26.   Develop Smart Event Handlers
27.   Choose <link> over @import
28.   Avoid Filters
29.   Optimize Images
30.   Optimize CSS Sprites
31.   Don't Scale Images in HTML
32.   Make favicon.ico Small and Cacheable
33.   Keep Components under 25K
34.   Pack Components into a Multipart Document

中文對照：

01.減少的http請求
02.使用CDN （內容分髮網絡）
03.指定到期時間
04.壓縮結構(GZIP)
05.樣式表檔案放在頂部
06.指令碼放在底部
07.不在css中使用運算式
08.將javascript和css檔案分離到單獨的檔案
09.減少dns查詢
10.精簡javascript代碼
11.避免重新導向
12.去掉多餘的指令碼
13.配置實體標籤
14.可快取的ajax