@Fillet: hsrob beat me to it, but really? Not much geometry? They were both the highest polygon games on any console when they released. 20 million a second in III.
And sparse environments with not much going on? The were often huge numbers of fighters and other vehicles in play at once. And didn't you play the Endor walker level in III? It was filled with destructible trees, swaying undergrowth, ewoks and stormtroopers running around on the ground, AT-STs attacking you, etc.










