Measuring Performance

Location: Salon E Level: Intermediate
Average rating: ***..
(3.80, 5 ratings)

Fast web pages are critical to a good user experience, but what is “response time” and how should it be measured? This panel discusses what parts of page loading should be measured and the importance of perceived versus instrumented speed. Frameworks for measuring response time are compared: services (such as Keynote, Gomez, and WebMetrics), home grown test labs, and instrumenting real user traffic. The challenges of, and possible solutions to, measuring Web 2.0 applications are discussed.

Photo of Steve Souders

Steve Souders


Steve Souders is chief curver at SpeedCurve, where he works on the interplay between performance and design. Steve previously served as Google’s head performance engineer, Yahoo’s chief performance officer, and Fastly’s chief performance officer. Steve pioneered much of the work in the world of web performance. He is the author of High Performance Web Sites and Even Faster Web Sites as well as the creator of many performance tools and services including YSlow, HTTP Archive, Episodes, ControlJS, and Browserscope. Steve taught CS193H: High Performance Web Sites at Stanford and serves as cochair of Velocity, the web performance and operations conference from O’Reilly.

Photo of Ryan Breen

Ryan Breen

Gomez Inc.

Ryan Breen is the vice president of technology at Gomez, a provider of Internet application performance information. After graduating from Duke University with degrees in computer science and economics in 2000, he led a team creating a suite of Web performance management technologies, including a Java-based, Web browser emulation platform. Using these tools, Ryan has worked with hundreds of top Internet companies to measure and manage the performance of their Web applications. As more customers have moved to Ajax technologies, Ryan has helped them define performance best practices applicable to the new development style.

Photo of Bill Scott

Bill Scott


Bill Scott recently joined Netflix, the world’s largest online movie rental service, as the Director of UI Engineering.

Previously, Bill led engineering for Yahoo! Teachers, a web 2.0 community allowing teachers to gather, organize & share web resources and lesson planning. In addition, as an Ajax Evangelist at Yahoo! he focused on spreading the goodness of “rich and sane” Ajax design & development. Bill is a frequent speaker at conferences and workshops discussing the nuances of good design and the challenges of great engineering. At Yahoo! Bill was also the Design Pattern curator where he launched the public Yahoo! Design Pattern Library (

Before Yahoo! Bill led User Experience at Sabre Airline Solutions and co-founded Rico (an open source Ajax framework, For 20 years Bill has bounced back and forth between design and engineering projects, creating products in areas as diverse as video games, widget libraries, war gaming, IDE tools, airline management and Web consumer sites. His musings can be found at

Photo of Ernest Mueller

Ernest Mueller


Ernest manages the DevOps Platform team and software releases for the SaaS company Bazaarvoice. He’s been a sysadmin, architect, manager, and programmer in turns for more than 15 years, and is now a cloud computing and DevOps practitioner and evangelist.

Photo of Scott Ruthfield

Scott Ruthfield

Rooster Park Consulting

Scott Ruthfield is founder of Rooster Park Consulting, a Seattle-based engineering leadership and custom software development consultancy, and is the acting VP of Engineering at Virtuoso, the industry’s leading leisure travel network. He was the previous VP of Engineering at, and ran various technology + business teams at He very occasionally blogs at

  • Akamai
  • Google
  • Hyperic
  • Sun Microsystems
  • 3Tera, Inc
  • Coradiant
  • Keynote Systems
  • Limelight Networks, Inc.
  • OpSource
  • TechRepublic

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