Sigh... Thinking up a different situation (or even an exception) doesn't make a general statement "not true". We aren't arguing mathematical theses here.

It is true that Intuit inserted some explicit delays to give the impression that their software is "working" really hard to deliver value. But, TurboTax is still very snappy in response to user action. That response is often an intentionally long, slow animation carefully designed to help you keep calm through a stressful process. But, the response came quickly.

Personally, I have measured direct correlations between our apps' latency&stutters vs revenue trends. This effect has been well publicized by Google and others. Users don't consciously give much of a shit. But, their behavior in end is significantly affected regardless.