You'll find that performance with a Rocket is subpar with built-in video. 8MB on the Rocket itself is ... meh.
In your defense though, finding a decent video card these days is not easy. One, they're obscenely expensive, and two, most of them are not accelerated. The Rocket however, can accelerate Radius video cards. Three, most of them don't support larger than 640x480 or there abouts unless they're the expensive kinds. Fortunately, the Mac OS works perfectly fine on 640x480, but 800x600 would be nice from time to time...