> hm, my OpenGl driver doesn't seem to work nicely with Squeak (it's an 
> ATI-consumer card OpenGl-driver...).

Latest driver? And I used to think that ATI's drivers had become 
better. It looks like NVIDIA still has the upper hand under OpenGL.

> One detail is a little bit annoying: If there is an overlap between 
> the 3D morph and some other one (e.g. the Workspace window) the 
> framerate drops by more than 50 percent.

This is normal. The accelerated 3D scene is actually shown in a 
separate window. To create the illusion of being able to have other 
Squeak stuff on top of the 3D window, all overlapping parts have to be 
rendered into a texture and uploaded to the 3D engine. This takes some 
time ;-)

- Bert -