It could, and I'm just guessing here, be attributed to the smooth scrolling feature. This is enabled by default in IE 7, but disabled in Firefox and (I think) Opera. For me smooth scrolling in IE and Firefox always has been extremely choppy regardless of the power of the computer I use it on. IE certainly is the worst of the two, sometimes totally freezing up when I try to scroll when a more intensive page is loading.
In IE 7, the fuction can be found by going to the "Tools" menu, selecting "Options" and then selecting the "Advanced" tab. If you cannot find the menu bar, press the "Alt" key to display it.
Scroll down in the box till you find the "Browsing" area. At the bottom of that, there should be a "Use Smooth Scrolling" checkbox. De-check it and select Ok.
After that, you should notice a massive increase in performance when scrolling overall.
BTW, has the .Org just had a downtime. Firefox was telling me that the document had no data and IE was totally stalling upon loading.
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