Slow Viewport Performance 3DSMAX 2011 with complex materials

OccultMonk

I have a 3DSMAX 2011 scene (directx mode) with many objects and when I assign complex Vray materials to the objects in the scene the viewport slows down to a crawl: 4FPS. When I apple a simple Vray material the viewport performance is about 40FPS. When I apply an simple Standard material the viewport performance is about 40FPS.

The complex Vray materials uses maps, composite maps and vray blend materials. Since VrayBlendMtl only displays one material there is no visual difference between the 4fps material and the 40fps material.

Is there a way to temporary disable the Vray material or show a different material in the viewport without having to reassign the material to the objects?

OccultMonk

Turning off the Viewport transparency from Best to None solved it. 4FPS --> 40/50FPS.

Viewport Configuration --> Transparency None