I think this is true in one sense and false in another. It's true because users often don't complain about or even consciously notice poor performance. So if y

I think this is true in one sense and false in another. It's true because users often don't complain about or even consciously notice poor performance. So if you are trying to sell a product, advertising performance benefits doesn't work well. People don't think they care (except in extreme cases). But it's false because even moderate performance differences actually have enormous and easily measurable effects on user behavior. So if you care about providing value, then performance is one of the most important things, and it's consistently overlooked because it doesn't sell.