We just purchased the XPS 17 with Geforce 555M card (and integrated HD graphics)..

In the drawings mode, if you hold the middle mouse button and try to move the graphic, it creates a shadow/trail effect, very sluggish.

In the assemblies/3d mode though it seems real smooth.

I've already set the application parameter to use the Nvidia as the primary card in the nvidia control panel..

Anyone else using the XPS17 and having this issue?  *in our case its solidworks 2011 sp1 actually (x64)