The Golden Rule of Web page performance:
Only 10%~20% end users spend their time on downloading HTML documents. The rest of the 80%~90% time is spent on all the components in the download page.
The remainder of the book guides the reduction of the 80%~90% end-user's corresponding time.
If you can follow all the rules that apply to your site, the speed of the page site will increase 20%~25%.
Start dry
Rule 1: Reduce HTTP requests
1. Image map (server-side image map, client image map)
2.CSS Sprites
3. Inline picture (ie not currently supported)
4. Merging scripts and style sheets
Rule 2: Use the Content Publishing network
Rule 3: Add a long Expires header, update the file name when upgrading
1. Using the Expires head
2. Using the Cache-control head max-age directive
Rule 4: Compression components (gzip)
Compress scripts and style sheets for files that are larger than 1KB or 2KB
Rule 5: Place the style sheet at the top
Use the link tag to place the style sheet in the document head
Rule 6: Place the script at the bottom of the page
Rule 7: Avoid CSS expressions
Rule 8: Use external JavaScript and CSS
1. Download after loading
2. Dynamic inline
Rule 9: Reduce DNS Lookups
Reduce DNS lookups by using keep-alive and reducing unique host domain names
Rule 10: Streamline JavaScript, CSS (using the appropriate tools)
1. Confusion (variable name, function name becomes shorter)
2. Save (remove blanks, annotations, etc.)
Rule 11: Avoid redirection
Rule 12: Remove duplicate scripts
Rule 13: Configure or remove Etage
Rule 14: Make Ajax cacheable
Ensure that AJAX requests follow performance guidance, especially with long expires headers
The book Analysis page recommended the use of Yahoo's YSlow tool, according to the page practice described in the book's performance rules of the merits of Chengdu to produce a separate score (a for the best, F is the worst).
This article is from the "AUB" blog, make sure to keep this source http://aubdiy.blog.51cto.com/2978849/1441346
Post-reading summary of the high Performance website construction Guide