Im an architectural drafter. I do mostly 2d work but do some 3d work. I am using autocad mechanical 2008 and it runs smoothly until i type in a command and move the mouse. when i do this my mouse starts to skip around and it becomes dificult to focus and snap to any point. the other problem is when i am working with a 3d model and i try to orbit in any mode but 3d wireframe every thing becomes distorted and overshadowed. If anyone knows why this happens please help! this is not a huge problem, just a very annoying one.

Hii'm 3d cad draugthman. i got the same problem like you got. this happen is becasue PC graphic system not as good to support 3d model. only way might be help you isturn off same of the layer. dont view everything together or put some complicated part into layer and turn off the layer. Or save entire model as a blockor copy your model to new sheet may be will become better (i did before its help)SAM