Spree commerce is capable of sizzling performance and smooth scalability. But why does performance matter so much? Because time is money. Amazon found that every 100ms of average responsiveness improvement boosted their revenue by 1%. AOL, Google, Yahoo! and Shopzilla have found similar or greater effects. With this backdrop, Daniel Sim Lind leads us through the performance testing journey that Rails hosting platform provider Ninefold took with Spree. We'll deep dive into the methodology and tools, the analysis, using user happiness as a testing constant, the results - and what it all means for you. Includes hot-off-the-press Spree 2-2 with cacheing test results, and a cheeky Magento comparison.