Well people tend to embellish when they talk about a product they're financially attached to. Go to the rMBP thread and ask the same questions and you'll have 100 responses discrediting the users claims of same speed. I've owned the MBA and the previous rMBP and am an owner of a rMB. It's silly to even suggest they're on the same performance field. Not saying the rMB doesn't perform well enough to be acceptable for many, I'm simply stating the experience in performance is like a Prius compared to a Porsche and that can be backed by specifications. Lol
What you miss over and over, and this is what is getting tiring, is that performance benchmarks that evaluate maximum sustained load are not particularly valuable in determining how well a device based on Core-M will work for the large number of users who have workflows that are generally not processor bound. I've been saying for years that most computers have processors that are excessively powerful for modern computing routines, and that we are missing out on smaller, quieter devices with better battery life because we are stuffing these power hungry processors into all sorts of mobile devices that don't really need them. Core-M is the result of that reality, and it's exactly the kind of processor I've wanted in a laptop for a long time. Until late last year, the only options were the 15w models, or Atom processors that were truly underpowered. Core-M brings the best of those two worlds - power and efficiency - into being.