I have a suggestion regarding the graphics performance of large assemblies.
I noticed that the graphics performance of Creo View is way better than the performance of Creo Parametric. This goes for both mouse spinning and spaceball spinning.
While a large assy is loading in Creo, the user sees a 3D preview that is zoomable and spinnable; I suppose that this is a Creo-View-kind-of-lightweight-Viewable embedded in the prt's and asm's.
So, what if Creo would momentary switch to a Creo View-like graphics mode whenever the user touches the spaceball, and switch back to "real" mode if the user lets go of the spaceball? I would expect that this would be fairly easy to implement, because the lightweight data is probably there in memory, and the current camera position is also known. It would dramatically enhance navigation within large assies.
Second suggestion, also very convenient in large assies: I've seen that other 3D CAD programs often have a Dice-shaped navigation tool in the corner of the viewport, which makes it easy to get e.g. the Front View of an assy with just one mouse click. Easier and faster than the Reorient menu.