1. 250ms is not quickly, on Firefox Windows a default page down animation is closer to 50-100ms (estimating), it's so fast you hardly even realize it's animatin

1. 250ms is not quickly, on Firefox Windows a default page down animation is closer to 50-100ms (estimating), it's so fast you hardly even realize it's animating. There are websites that override this with their custom slow animations - those type of page downs suck yes, hence my inclusion of quickly in my first post. 2. Page down doesn't always scroll the same distance when you hit the end of the page, unless you have over-scrolling like some code editors do but websites and browsers don't. For media naturally represented as pages, like PDF or images, and when one whole page fits on a screen there's a different story though, there it's nice to be able to jump pages instantly without animations, because the page boundary itself can be used as reference. But for reflowing endless wall of text media like web pages and code you kindof need to follow your previous position as a reference.