I've just upgraded to Vue 9 Esprit 64bit from Vue 6 32 bit. Tried loading an old Vue 6 scene and it seems to slow everything down, from moving around the scene to selecting an object.
Also the 'Global Radiosity' atmosphere used in Vue 6 doesn't quite look the same when rendered in Vue 9. Vue 9 I notice doesn't have this choice in the atmosphere selection.

Any help appreciated.