1. Optimizing Client-Side Performance by Andrew Ivachewsky

3. Accept Slow Networks

4. Meet Performance Requirements

6. Make stylesheets and scripts external

7. Create sprites for CSS background images

8. Create image maps for page images

10. Keep scripts at the bottom

11. Remove duplicate scripts

12. Strive to make page render progressively

15. DNS information is stored at OS DNS cache and browser cache

16. Keep balance between number of unique hostnames on page and parallel downloads

19. Saves network bandwidth

21. Proxy cache

23. s-maxage=[seconds] which applies to proxy caches

24. public indicates that response may be cached

25. private indicates that response is intended for single user only and must not be cached by a proxy cache

26. no-cache forces cache to submit the request to origin server for validation before releasing a cached copy

28. Cache static content for a longer period

29. Use a cache-friendly folder structure

30. Reuse common graphics files

31. Change filename when you want to expire a cache

32. Use a version number when accessing static files like /static/images/image.gif?v=23424

33. Store cacheable files in a different domain

34. SSL, HTTP POST requests are never cached

36. Popular minification tools JSMin and YUI Compressor

39. CDN servers are distributed across multiple locations

40. For incoming request CDN selects server with fewest network hops or server with quickest response time

43. Tools: Firebug http://getfirebug.com/ HttpWatchhttp://www.httpwatch.com/ YSlowhttp://developer.yahoo.com/yslow/ JSMinhttp://crockford.com/javascript/jsmin YUI Compressor http://developer.yahoo.com/yui/compressor/ Apache Benchmark http://httpd.apache.org/docs/2.0/programs/ab.html Contacts: skype: iv_andrew ?