I am working with an HP Elitebook 8740w and for some reason when editing a part in an assembly it's really slow and jerky when rotating the model. Same when editing a sketch. It moves fast and responds real fast otherwise. The editing thing is a real drawback though. Any help would be greatly appreciated. Am a little desperate already. If you shell out \$2500 for a system you want it to perform.

Intel Core i7 Processor

HP Elitebook 8740w

4 gig ram

nvidia quadra fx 2800m

Windows 7 Pro 32bit