[shajznnckfke]

I worked at a big web site and we could demonstrate lots of incremental revenue (many millions of dollars) from a change like this. Even though it doesn’t seem noticeable to an individual, it adds up. If you draw a graph with page load time on one axis, and usage on the other, it’s a smooth curve, not a step function. Out of all your customers, some fraction of them are going to get distracted and disengage after 3 seconds but not after 2.9 seconds.

Imagine you lower the grip on everyone’s tires by 3%. Most people wouldn’t notice, but for a few people it will prevent them from being T-boned when they wait too long to brake for a red light. That improvement would be measurable if your data was good enough. I’m not saying optimizing your website is important like preventing car crashes, but it’s an illustration of how a small change can lead to a measurable improvement.