Is SketchUp set to use the graphic card for rendering? How big is the model (file size and polygon count). Are shadows and/or profiles turned on? Are any extensions installed?
So yes, SU is set to use the graphic card. The slow performance is in all aspects, including just opening the file (from local disk).
This is info from one of the files:
4877 component definitions
Faces 2152067
Shadows off
No extensions on
File imported from AutoCad file (DWG)
Size Sketchup ; 521 MB
It sounds to me the problem is with the file and SketchUp’s ability to import DWGs. SketchUp doesn’t support real curves and circles, only segmented representations, and the DWG importer creates a quite huge amount of segments.