The page uses sIFR <http://www.mikeindustries.com/sifr/> to replace title text with images (usually to get better looking type and gain access different fonts). sIFR is flash-based, so each header becomes a flash plugin. This page has *many* instances of the flash plugin, and scrolling lags horribly even on this macbook pro.
This is definitely Adobe's bug. The reason why scrolling lots of Flash plugins isn't as slow in Firefox is that the Flash player decides (for whatever reason) not to use its new OpenGL rendering mode in Firefox. A sample of both browsers proves this.
Mass-unassigning my bugs (I'm working on another team right now)
NPAPI plugin support has been removed. Hence, this can be marked as "RESOLVED WONTFIX". Thanks!