I think they're talking about animating scroll changes. Web browsers do this, if you press page down, it animates the change(it's subtle, the animation only las

I think they're talking about animating scroll changes. Web browsers do this, if you press page down, it animates the change(it's subtle, the animation only lasts a fraction of a second). In Vim, it'll just do an instant repaint, so you kind of lose context.