If you design a flow, you’re going to include a progress indicator, right? If you have a button, you’re going to specify where it takes the user, right? Well, don’t tell the thought leaders we told you this, but it really does depend! At Vistaprint, we are constantly running “Mega Split Run” tests (i.e., A|B testing on steroids!). We balance these test results with site metrics and user-centered design principles to inform our design decisions. Some UX best practices have been validated for our customers, while others we flat out ignore -- we’ll share examples of how tried and true usability best practices aren’t always the right answer. Our discussion will highlight some of the takeaways that brought us to this conclusion. We’ll ask the audience to compare notes on collective experiences, hypotheses and expectations around design performance. Finally, we’ll discuss how we balance site performance testing with user centered design activities as a whole, including usability research and testing. This presentation will be a lecture format with some audience participation.