This document discusses the importance of website speed and provides tips to improve performance. It notes that users now expect pages to load within 2 seconds and that slow speeds can negatively impact business metrics like conversions. Both synthetic and real user monitoring are described as ways to measure performance, with real user monitoring representing the actual user experience. Specific recommendations to improve performance include leveraging browser caching, compressing content, limiting requests, optimizing images and files, and monitoring third party impacts. The key messages are that speed matters for users and business, performance should be constantly measured, and treated as a high priority feature to optimize.

1. High Speed Web Sites At ScaleBuddy Brewer

2. About BuddyI build web performance monitoring products and help companies make their sites fasterFrom San Francisco Bay Area, CaliforniaCo-Founder Log-Normal, Inc.http://lognormal.com@bbrewer

3. Does speed matter?How fast is my site?What can I do about it?

4. Does speed matter?How fast is my site?What can I do about it?

6. In 2006, the average online shopper expected a web page to load in 4 seconds. Today, that same shopper expects your page to load in 2 seconds or less. (Forrester Consulting)A 1-second delay in page load time equals 11% fewer page views, a 16% decrease in customer satisfaction, and 7% loss in conversions. (Aberdeen Group)One e-commerce company found that every 100ms delay cost them 1% of sales. (Amazon.com)

7. Does speed matter?How fast is my site?What can I do about it?

8. Synthetic monitoring

9. Synthetic: BenefitsObject-level response times

10. Visibility into third-party performance

11. Visibility into HTTP headers (caching, compression, etc)

12. Can test parts of your site that aren’t frequented by users

13. Can get back-end performance for older browsersSynthetic: Drawbacks Not representative of real users

14. Limited coverage of popular browsers

15. Limited insight into mobile devices and connections

16. Sometimes limited geographic coverage

17. Must know in advance what parts of your site you want to analyze

18. Results can be “gamed” by clever third party vendorsReal User Monitoringhttp://www.flickr.com/photos/criminalintent/97181432/

19. Real User Monitoring: Benefits Represents the “truth” – by measuring real visitors to your site

20. You automatically measure the parts of your site that matter to users

21. Total browser coverage (as long as they support Javascript)

22. Works equally well on today’s mobile and desktop web browsers

23. Difficult for third party vendors to game

24. Can measure performance in the context of business goals (conversions, etc)Navigation Timinghttps://dvcs.w3.org/hg/webperf/raw-file/tip/specs/NavigationTiming/Overview.html

25. Real User Monitoring: Drawbacks No object-level response times (yet)

26. You have to add code to your site

27. User privacy concerns must be navigated

28. No back-end performance data for legacy browsersResources Free / open source monitoring tools

29. Synthetic: WebPageTest (http://www.webpagetest.org)

30. Real user: boomerang.js (http://github.com/yahoo/boomerang)

31. Plenty of commercial options tooDoes speed matter?How fast is my site?What can I do about it?

32. Use the browser cacheHTTP 1.0 – Expires: HTTP 1.1 - Cache-Control: max-ageWatch out for Etags!Source: http://httparchive.org/interesting.php#max-age

33. Compress, shed weight, limit requestshttp://httparchive.org/interesting.php#onLoad

34. Compress, shed weight, limit requests Make sure Gzip is turned on!

35. Consider explicitly testing for Gzip support

36. Google found 15% of browsers that support Gzip don’t say so

37. Optimize images (JPEG metadata, colors/channels, smush.it)

38. CSS sprites, JS minify, combine stylesheets and JS files where possiblehttp://httparchive.org/interesting.php#onLoad

39. Watch out for third partieshttp://httparchive.org/trends.php#numDomains

40. Consider using a content optimizer

42. Summary Make end user performance a priority

43. Measure your site constantly

44. Treat performance like a featureБольшоеспасибоhttp://lognormal.com@bbrewer