Why do you keep focusing on the numbers in my hypothetical examples? If you've run a large enough website, with enough users small optimizations end up being ma

Why do you keep focusing on the numbers in my hypothetical examples? If you've run a large enough website, with enough users small optimizations end up being magnified into real effects. That's the point, and you're missing it again by being pedantic. Beyond that, specific claims like "when you create sites like banking websites is that it is more often slower" are things that require evidence, and are much more in the category of 'pulling something out of your ass' than me very clearly constructing reasonable hypotheticals, not making claims about what would happen on a specific site or situation. fwiw: I have run lots of A/B tests and in many cases converting things to AJAX-y, less HTTP-y solutions increases metrics meaningfully (like being able to add things to a list in a single click, instead of a full HTTP POST), and in many cases it does not (like in cases of infinite-scrolling through results.) Go figure, context matters and making flat-out claims is dumb. It's perfectly reasonable to believe there is some significant chance that a highly interactive site like a bank could see real meaningful changes in user behavior if it avoided doing full HTTP postback for all its pages.