Why are huge polygon amounts bad? It is always said that the polygon amount of a single modell must be as little as possible when it comes to realtime simulations such as computer games. (Or at least lower than when rendering a movie) I am fully aware that this must be done in order to save performance. But aside from that information i cannot find why huge polygon amounts must be avoided. (In Short I know that polygons eat performance. I want to know why they eat performance) So my question would be What happens when a frame is rendered? The polygons are surely somehow processed in the graphicard. What happens there?. If possible i would like to have some links to sites containig this information.