Web Performance is a new trend in web application performance analysis and measurement which specializes in overall user experience instead of traditional approach that primarily looks at server performance. Sergey Chernyshev will describe the differences between the two approaches, show why it is important to distinguish between performance and scalability and talk about new tools that go beyond load testing.

1. Web Performance:
beyond load testing
January 27, 2012
Sergey Chernyshev
Technical Director
Web Systems & Applications
truTV Web Services, Turner

2. NY Web Performance
1250+ members
4400+ worldwide
since May 2009

3. Scalability & Performance

4. What is Web Performance?
WPO improves the speed of web
experience for each end user
It is NOT how many users a web site can serve
(Scalability)
It is NOT how often a web site is down
(Reliability)

5. Scalability & Performance

6. Why Web Performance?
Increasing revenue vs. cost optimization
• Shopzilla +7-12% conversions! &
• +15% (+60M) downloads for Firefox.
(-1 sec => +2.7% downloads)
• Slowness is sticky (Google and Microsoft)
• SEO: Google uses site's speed in ranking

7. Abandonment Rate
How Loading Time Affects Your Bottom Line. KISSmetrics
http://blog.kissmetrics.com/loading-time/

8. Why Web Performance?
User experience
"participants had to
concentrate up to 50%
more"
"greater agitation and
stress"
Web user connected to EEG
"40% will go to a rival web
site, 37% will abandon"
Web Stress. A wake up call for European business. Foviance on behalf of CA
http://www.ca.com/Files/SupportingPieces/final_webstress_survey_report_229296.pdf

9. Server Time vs. Browser Time
88 requests, 6.344s only 0.968s on backend = just 15%

10. Server Time vs. Browser Time
151 requests, 6.3s, only 0.1s on backend - less then 2%

11. Page Statistics
2003 2009
Size: 93.7K 507K
Objects: 25.7 64.7
Average Web Page Size Quintuples Since 2003
Andrew King (websiteoptimization.com)

12. Average Web Page Size Quintuples Since 2003
Andrew King (websiteoptimization.com)

13. Page Statistics
• Load Time: +0.533 s
• Time to first byte: +0.117 s
• Time to start render: +0.179 s
• Page Size: +48 KB
• Requests: +4
just 1 year
• Connections: +1
(2010)
• DNS Lookups: +1
Are pages getting faster? Patrick Meenan (webpagetest.org)

14. Tools: Analysis
• Yahoo's YSlow (best practices)
• Google Page Speed (best practices)
• WebPageTest (web based waterfalls and more)
• dynaTrace AJAX Edition
• REDbot (HTTP caching)
• DOM Monster (DOM analysis)
• *HAR format (HTTP data format)

15. Tools: Monitoring
• ShowSlow (basic metrics and best practices)
• WebPageTest + ShowSlow ("geo" testing)
• Boomerang, Newrelic (RUM)
• Catchpoint
• Keynote, Gomez

16. Tools: Optimization
Dev tools WPO automation
• SVN-Assets
• mod_pagespeed
• JSMin, Closure • Yottaa
Compiler
• Strangeloop
• CSSLint
• Torbit
• SpriteMe,
imgmin, • Google Page Speed
JPEGmini service

17. Add
Web Performance
to your SLAs!

18. Q&A
URL: http://meetup.com/Web-Performance-NY/
Email: sergey.chernyshev@turner.com
@SergeyChe
@PerfPlanet