Framerate

Game developers are demanding higher fill rates so they can push resolutions to 1024x768, create larger polygon-count models, and add more special effects without slowing framerates to a crawl.

The worst I saw was EA's Need for Speed: Most Wanted. This astounded me because of the ways it was poor - framerate was low, pauses were evident, and the render and model quality, apart from what looked superficially like high dynamic range lighting effects, were not significantly different to what is already readily achievable on Xbox.

Higher framerates can increase this bound, since the maximum delay between two cameras capturing an image will decrease.