All links are listed in order, from most recent to least recent.
Ecommerce/conversions
Level 3 and Strangeloop reduce Golf Warehouse load times by 50% [article]
Level 3 – April 24, 2012
Summary: Learn how the world’s largest golf retailer is enjoying remarkable improvements in both site performance and user experience: "Level 3's Total Site Performance solution cut our load time in half from 10 seconds to five without the need for additional hardware...”
Real User Monitoring at Walmart.com [case study]
SF Web Performance Meetup - Feb 16, 2012
Summary: Cliff Crocker, Aaron Kulick, and Balaji Ram joined forces at a meeting of the SF Web Performance Meetup to tell a RUM (real user monitoring) story through the lens of three job functions at Walmart.com: the performance data analyst, the developer, and the business analyst. Some excellent slides demonstrating the business value of performance.
No framework needed [case study]
37signals - Feb 8, 2012
Summary: Nice case study from 37signals about how they shaved 500ms from a page and got a 5% conversion bump.
"And that is why you need to speed up your site!" [case study]
André Scholten - May 30, 2011
Summary: Excellent speed-revenue benefit analysis from performance consultant André Scholten. By using browser type and connection speed as proxies, he uses Google Analytics to show that faster sites make more money.
AutoAnything cuts page load time in half and revs up sales by 13%
Strangeloop case study
Summary: "The Strangeloop Site Optimizer has obviously improved conversion and revenue for us. When you affect conversion by 9%, that is very significant on an annual basis."
The Growing Need For Speed: How Site Performance Increasingly Influences Search Rankings
Retail Touch Points - May 19, 2011
Summary: For Smartfurniture.com, faster pages = 20% more organic traffic = 14% more page views = more online sales.
Attention skeptics: Web performance optimization works! [blog post]
Sajal Kayan - May 14, 2011
Summary: Nice little case study from performance engineer Sajal Kayan, demonstrating a correlation between improved page speed, number of page views, and Google Adsense revenue.
Cramming data in smaller packages can decrease page download time [case study]
Internet Retailer - Apr 19, 2011
Summary: Great little case study in which Office Depot compresses files and reduces page size for its mobile site by 40%.
How Edmunds got in the fast lane
Edmunds Technology - Nov 22, 2010
Summary: Step-by-step breakdown of how Edmunds.com analyzed and fixed performance issues with its third-party apps. Results: web page load times went from 9 to 1.4 seconds, and revenue increased by 3%.
Firefox and Page Load Speed, Part II
Mozilla - Apr 5, 2010
Summary: Mozilla shaved 2.2 seconds off their landing pages, thereby increasing download conversions by 15.4%, which they estimate will result in 60 million more Firefox downloads per year.
Proof that speeding up websites improves online business
Watching Websites - Sep 29, 2009
Summary: Case study showing how performance optimization improved conversion rate by 16.07% and cart size by 5.51%.
Shopzilla's Site Redo: You Get What You Measure
Shopzilla - Jun 23, 2009
Summary: Shopzilla sped up its average page load time from 6 seconds to 1.2 seconds and experienced a 12% increase in revenue and a 25% increase in page views.
Make Data Useful
Amazon - Nov 28, 2006
Summary: Amazon found that it increased revenue by 1% for every 100 milliseconds of improvement.
Traffic/page views
O'Reilly Media delivers sub-2-second page load times to 87% of visitors
Strangeloop case study
Summary: "Our goal is a two-second page load time for our site's visitors. Before testing Strangeloop's product, 12% of our site traffic hit that goal. During our three-month trial run with Site Optimizer, that number leaped to 87%. The decision to implement was clear."
Attention skeptics: Web performance optimization works! [blog post]
Sajal Kayan - May 14, 2011
Summary: Nice little case study from performance engineer Sajal Kayan, demonstrating a correlation between improved page speed, number of page views, and Google Adsense revenue.
Case Study: Impact of Code Cleanup on Site Traffic [article]
Search Engine Watch - Mar 6, 2011
Summary: How one site reduced page load times from 15s to 5s and cleaned up broken links and redirects, and as a result experienced a 40% traffic increase.
The Secret Weapons of the AOL Optimization Team
AOL - Jun 23, 2009
Summary: Visitors in the top ten percentile of site speed viewed 50% more pages than visitors in the bottom ten percentile.
YSlow 2.0
Stoyan Stefanov - Dec 6, 2008
Summary: Yahoo increased traffic by 9% for every 400 milliseconds of improvement.
Mobile performance
Twitter’s mobile web app delivers performance [blog post]
Twitter Engineering Blog - Sep 14, 2011
Summary: In-depth look at how Twitter developed its mobile app to maximize speed and performance.
Optimizing end user experience for one mobile device – Not good enough!!!
Keynote blog - Sep 13, 2010
Summary: Test of the New York Times website on four popular devices resulted in four different pages with a different amount of data for each: "What was astonishing was not that the pages were different, but the huge variation in bytes downloaded."
Search engine optimization
The Growing Need For Speed: How Site Performance Increasingly Influences Search Rankings
Retail Touch Points - May 19, 2011
Summary: For Smartfurniture.com, faster pages = 20% more organic traffic = 14% more page views = more online sales.
Effects of website speed optimizations on Google
LightSpeedNow - Jul 31, 2010
Summary: After speeding up web page load times by 45%, a test site experienced a 15% increase in Google search traffic.
Third-party content
A Faster Bar - A Better User Experience
Meebo - Jul 23, 2010
Summary: How the Meebo development team implemented five performance best practices to improve their Meebo bar.
Other
The Need for Speed [case study]
Chemeo - Feb 2012
Summary: Excellent case study for web performance geeks: How Chemeo delivers "pure bounce with pure value".
Balancing front-end reporting and tracking [blog post]
The Guardian UK - Feb 14, 2011
Summary: A sign that web performance has arrived as a mainstream issue: The Guardian writes about its own performance-tuning efforts in its dev blog.
Case Study - The North Face
Bullet Bits - Jan 3, 2011
Summary: Great waterfall analysis of a North Face product page, conducted by performance consultant Duncan McDougall.
The Website Sausage Factory and Impact on Performance – a TechCrunch Case Study
Keynote - Dec 31, 2010
Summary: TechCrunch has become a performance whipping boy. Keynote’s Ian Withrow wrote this excellent (and entertaining) blog post in which he analyzed exactly how TC’s page bloat happens.
Building Performance into the New Yahoo Home Page [presentation]
Nikolas Zakas - Jun 23, 2010
Summary: Case study of adding advanced performance techniques including progressive enhancement.
