From my experience there is nothing you can really do to improve multi-tasking with Vue. (using winxp here) Open your task manager and look at the processes. Then start rendering even the most basic scene(new with no objects) at say 800x600 at broadcast quality. You will see the cpu usage for vue go to 99 and most like 100% for the entire machine.

I have found that multi-tasking is NOT an option with Vue. :)