Just to add my own experience with it... I have noticed just once that the scroll speed got "laggy" when scrolling through heavily colored text (a bunch of testing I was doing for a script that had a lot of colors on each line and filled almost a full maximized window). As soon as I got beyond that, it went back to normal, but every time I went over that area, it got noticeably slow. I've never noticed that happen before, but wanted to put out the info about lots of color changes being a factor.
Specs:
Athlon XP 6000+, 2GB RAM, GeForce 220, Windows 7 Ultimate 32bit
