So, to address the scrolling issue, and hopefully better explain it: When scrolling up or down a page very quickly, the page seems to experience tearing, where blocks of the page seem unable to render fast enough to catch up with the scroll speed. I can see chunks of checkerboard transparency for split seconds at the top or bottom edges of the page before they fill in. It is pretty jarring in a dark room, and not particularly pretty. So far I have been able to reproduce the scrolling issue to a lesser degree on my work machine, which would seem to eliminate hardware from the equation. It also does not happen if I grab the side scroll bar and zip it up and down as fast as possible. Only the scroll wheel or track pad seems to set it off, and only at high scroll speeds. I cannot reproduce it in Firefox, only Chrome, as Firefox seems to have an upper limit on scroll speed that is less than that of Chrome. What else can I try to get to the bottom of this? Update: the issue does not happen on other sites. I even tried a couple other XenForo demo sites without seeing it. If you can remind me what the name of the theme we are using is I can go try to hunt one of those down for further testing.