See https://docs.google.com/document/d/1YVO9FGRBF1RUsedU28H6P8lt9bDpOci0vi0CLSkFih8/edit# for a less-in-depth study. 

The page plays a video. That's it. This requires significantly more CPU cycles from Chrome than Safari, which suggests that our compositing/video pipeline is bloated. A more in-depth study seems worthwhile.