Keynote&#174; (NASDAQ: KEYN), the global leader in Internet and mobile cloud testing and monitoring, announced the winners and losers from Sunday's Super Bowl advertisers, measuring their Web performance across desktop, tablet and smartphone screens. For the first time, Keynote measured Super Bowl advertisers' websites before, during and after the Super Bowl to see how they fared in speed and reliability once the traffic started hitting. The good news: most retailers and automakers exhibited strong performance, delivering within industry best practices across the three screens. The winners in each category were: GoDaddy (desktop); Axe (tablet); and BestBuy (Smartphone).The bad news: some of the major consumer packaged-goods names, notably Coca-Cola with its heavily promoted "Coke Chase" campaign, showed unacceptably slow response times on mobile devices and even desktops. From 5:00pm to 9:00pm PST, the Coca-Cola site crashed repeatedly for consumers trying to access it on mobile devices and laptops. During that time period Keynote measurements showed that the Coca-Cola smartphone site was completely unavailable, and more than 70% of visitors to the desktop site were turned away. For those that did reach the site, it took almost 15 seconds to respond, making it the worst performer in that category.Century 21 placed last in the smartphone category with a staggering 54 seconds response time. Doritos took the bottom spot in the tablet category with a response time of just over 17 seconds.Overall there were some unimpressive mobile numbers &#8211; 11 advertisers came in with over 15 second response times (Century 21, Doritos, Hyundai and Kia, Mio from Kraft Foods, Pepsi, RIM/Blackberry, Samsung (an astounding 36 seconds from the smartphone maker), Sodastream, Walt Disney Pictures for Oz (40 seconds) and Wonderful Pistachios."Given the money spent and the high-profile brands promoted, we were surprised to see how poor some of these numbers are," commented Nick Halsey, chief marketing officer at Keynote. "Clearly the next challenge for these multi-channel campaigns is to better prepare for the three-screen delivery model; testing, monitoring and load testing end user experience prior to special events and to assure day-to-day performance are mission-critical. It's not enough to simply hope the desktop site will run on a mobile device, particularly when some of the content is rich video and animation."MethodologyKeynote used the following methodology to measure website performance:Web/Desktop &#8211; Measurements were made from 10 U.S. locations every 30 minutes using a real Internet Explorer 9 browser;&#160;Tablet - Measurements ran over Mobile Web Perspective&#174; every 30 minutes from New York and San Francisco on the iPad 2. (Keynote chose the iPad running over a LAN option as this is how the majority of iPad users access the Internet, so this reflects most common scenario); Mobile (Smartphone) - Measurements ran every 60 minutes over the air from New York and San Francisco on iPhone 4S (San Francisco &#8211; Verizon OTA, New York &#8211; Sprint OTA).Keynote (NASDAQ:KEYN) is the global leader in Internet and mobile cloud testing &amp; monitoring. Keynote maintains the world's largest on-demand performance monitoring and testing infrastructure for Web and mobile sites comprised of over 7,000 measurement computers and mobile devices in over 275 locations around the world that enable companies to continuously improve the online and mobile experience. Known as 'The Mobile and Internet Performance Authority&#8482;,' Keynote offers three market-leading product platforms.Read our MediaBizBloggers.com Super Bowl Commentaries: Time to Get Paid: How Joe Flacco and Twitter Make the Most of Their Super Bowl Experience - Chris Copeland-GroupM Next For Super Bowl Advertisers, the Biggest Buzz Comes via the Water Cooler, Not Twitter. - Ed Keller The Super Bowl is Just One Example of the Power of Social Viewing - Ed Keller How to Maximize A Super Bowl Ad's Word of Mouth &#8211; Part 2 - Graeme Hutton-UM Check us out on Facebook at MediaBizBloggers.comFollow our Twitter updates @MediaBizBloggerThe opinions and points of view expressed in this commentary are exclusively the views of the author and do not necessarily represent the views of MediaBizBloggers.com management or associated bloggers. MediaBizBloggers is an open thought leadership platform and readers may share their comments and opinions in response to all commentaries.