What is performance?

• Performance is how fast your site works or one user
• NOT how many users it can serve (Scalability)
• NOT how often it's down (Reliability)

Why do we need to care?

• User experience
• Money!!!
  • +100ms → -1% sales (Amazon) *
  • +400ms → -5-9% full-page traffic (Yahoo! Autos front page) **
  • +500ms → -20% searches (Google) ***
• NEW: Google's Let's make the web faster initiative
• NEW: Search Engine Optimization (SEO) *

Google Webmaster Tools

DEMO

Front-end: Start Here!

Top 1000 Home pages, growth in just 1.5 years.

Jun 2006 - Jan 2008

* Average Web Page Size Triples Since 2003, as of end of 2007 (via Nicole Sullivan)

Amazon Waterfall!

• Total Requests: 88
• Total Time: 6.344 seconds
• Back-end Time: 0.968 seconds = just 15%

CNN Waterfall!

• Total Requests: 174
• Total Time: 4.406 seconds
• Back-end Time: 0.171 seconds = less then 4%

Tools

• Waterfallers (Firebug, WebPageTest, HTTP Watch, MySpace's Performance Tracker)

Waterfall on Firebug's net panel

DEMO

Tools

• Waterfallers (Firebug, WebPageTest, HTTP Watch, MySpace's Performance Tracker)
• Graders (Page Speed, YSlow, WebPageTest)

Google Page Speed

DEMO

Tools

• Waterfallers (Firebug, WebPageTest, HTTP Watch, MySpace's Performance Tracker)
• Graders (Page Speed, YSlow, WebPageTest)
• Grade monitors (Show Slow, Mozilla Cesium)

ShowSlow

DEMO

Tools

• Waterfallers (Firebug, WebPageTest, HTTP Watch, MySpace's Performance Tracker)
• Graders (Page Speed, YSlow, WebPageTest)
• Grade monitors (Show Slow, Mozilla Cesium)
• Optimizers

More info

• Google's Let's make the web faster initiative
• Page Speed best practices
• YSlow best practices
• TechPresentations.org/Performance

Join Us

• Meetup: http://www.meetup.com/Web-Performance-NY/
• Twitter: @nywebperf
• Wiki: http://www.nywebperformance.org/
• LinkedIn group

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