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Mike Bailey

Melbourne Ruby Users Group
        July, 2010
Go Faster, Webmaster!
Talks by techies from:

Google, Yahoo, Microsoft, Amazon, Twitter,
Facebook, Firefox, Firebug, Chrome, Internet
Explorer and more!

1200 attendees (sold out)

Mostly technical audience
The Need for Speed
The Need for Speed

"Average load time of a web page is 4.9 seconds"
              - Urs Hölzle, Google
The Google Analytics exit rate for different page load times collected from Wikia data. Measured over 29 million pageviews
The Need for Speed

"Average load time of a web page is 4.9 seconds"
              - Urs Hölzle, Google
The Need for Speed

  "Average load time of a web page is 4.9 seconds"
                - Urs Hölzle, Google

          "The goal should be around 100 ms,
the time it takes for a reader to turn the page in a book"
                  - http://oreil.ly/bvYNk3
The Need for Speed

Google: +500 ms -20% traffic*
Amazon: +100 ms -1% sales*




     * http://bit.ly/9iRqAu
We monitor backend performance
but what about the front end?
the importance of frontend
               performance
               9%                91%




                 17               83%
                 %


                      iGoogle, primed cache




                      iGoogle, empty cache
Steve Souders http://bit.ly/Zxh4m
time spent on the frontend
                             Empty Cache   Primed Cache
   www.aol.com                      97%             97%
   www.ebay.com                     95%             81%
   www.facebook.com                 95%             81%
   www.google.com/search            47%              0%
   search.live.com/results          67%              0%
   www.msn.com                      98%             94%
   www.myspace.com                  98%             98%
   en.wikipedia.org/wiki            94%             91%
   www.yahoo.com                    97%             96%
   www.youtube.com                  98%             97%
Steve Souders http://bit.ly/Zxh4m                April 2008
The Performance Golden Rule

      80-90% of the end-user response time is
         spent on the frontend. Start there.
greater potential for improvement
simpler
proven to work



Steve Souders http://bit.ly/Zxh4m
To Measure is to Know
To Measure is to Know

Firefox - Firebug -> Net Window
To Measure is to Know

Firefox - Firebug -> Net Window

Chrome, Safari -> Web Inspector
To Measure is to Know

Firefox - Firebug -> Net Window

Chrome, Safari -> Web Inspector

IE -> HTTPWatch ($395-$44,395)
To Measure is to Know
To Measure is to Know

webpagetest.org
Go Faster, Webmasters
To Measure is to Know

webpagetest.org
To Measure is to Know

webpagetest.org

Webmaster Tools -> Labs -> Site Performance
Go Faster, Webmasters
To Measure is to Know

webpagetest.org

Webmaster Tools -> Labs -> Site Performance

showslow.com
Go Faster, Webmasters
Commercial Monitoring Services

gomez.com

keynote.com

webmetrics.com
How do we speed up our pages?
How do we speed up our pages?
How do we speed up our pages?
1. MAKE FEWER HTTP REQUESTS
            2. USE A CDN
            3. ADD AN EXPIRES HEADER
            4. GZIP COMPONENTS
            5. PUT STYLESHEETS AT THE TOP
            6. PUT SCRIPTS AT THE BOTTOM
            7. AVOID CSS EXPRESSIONS
14 RULES
            8. MAKE JS AND CSS EXTERNAL
            9. REDUCE DNS LOOKUPS
           10. MINIFY JS
           11. AVOID REDIRECTS
           12. REMOVE DUPLICATE SCRIPTS
           13. CONFIGURE ETAGS
           14. MAKE AJAX CACHEABLE
Analysis Tools
Analysis Tools

YSlow
Analysis Tools

YSlow

Page Speed
14 Rule Redux

Make Fewer Requests
- combine javascripts, stylesheets
- use css sprites
- reduce DNS lookups
- avoid redirects
- enable proxy and browser caching of assets

Make Smaller Requests
- gzip components
- optimize images
- minify javascript
Tools to Help

http://spriteme.org/

http://smush.it/

http://stevesouders.com/cuzillion/
The Problem(s) with TCP
The Problem(s) with TCP

RFC 2581 TCP Congestion Control
John Rauser http://oreil.ly/dkvpgM
John Rauser http://oreil.ly/dkvpgM
The Problem(s) with TCP

RFC 2581 TCP Congestion Control
The Problem(s) with TCP

RFC 2581 TCP Congestion Control

RFC 813 Delayed ACK
John Rauser http://oreil.ly/dkvpgM
John Rauser http://oreil.ly/dkvpgM
John Rauser http://oreil.ly/dkvpgM
Real World Data




http://mike.bailey.net.au/blog?p=38
The Problem(s) with TCP

RFC 2581 TCP Congestion Control

RFC 813 Delayed ACK
The Problem(s) with TCP

RFC 2581 TCP Congestion Control

RFC 813 Delayed ACK

Google have proposed improvements
Quick wins
Quick wins

Google AJAX Libraries API
Quick wins

Google AJAX Libraries API

GA Async Tracking Code
Want to learn more?

Videos from Velocity 2010 http://bit.ly/bL0Msz

Read Steve Souder's books,

"High Performance Web Sites" & "Even Faster Web Sites"

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