well, you could also go into the options screen (within Vue) and set the slider for "instant draw" closer to Fast. Vue does two refreshes in order to display the quad views, an Instant Draw and a Final Draw. Pushing this slider farther to the left will decrease the quality of the instant draw, but also vastly decrease the delay between updates. It will have no effect on the final view quality, so if you want to see the full shading, just wait for Vue's drawing threads to catch up. In complex scenes or scenes with heavy fog, that can take a while, even on a fast machine. Hope this helps you out!