"This page will open the selected gallery automatically in 3 seconds. If not, you can visit that gallery by clicking here."
I see this so often, and I'm puzzled.
Why do web pages have a built-in 3-second delay?
In particular, since I can override (or at least shorten the delay), why not reduce it to one second, or just do away with it forever?
What is/was the purpose of this technique?