Here are a couple of things to try which can improve Vue performance:

1. Turn the Viewport displays to "Filled Box after positioning your characters.  This will basically shut off Open GL inside of Vue.

2. Turn the undo system down to the minumum amount of undo's.  Currently, he lowest level is one.

3.  Turn off the background draw thread.

Vue 6 still has performance problems with imported Mesh objects although it's very dependent on the type of machine and graphics card combination.