Disabling the hamachi network adapter worked for me also. Considering the earlier replies I'd go out on a limb and say it's something related to how the program handles internet traffic.
Here's my files. The output and save are after I talked a few times to the merchant in the encampment and opened my inventory a few times. Experienced a delay each time.
DxDiag.txtoutput_log.txtsavefile.zip
Same problem.
System info:
Intel i7-2630QM @ 2 Ghz
Nvidia GTX 560M
8 Gigs of RAM
Windows 7 Ultimate x64
Graphics driver version: 347.88
Hope any of this helps and looking forward to the issue being fixed so I can enjoy what seems to be an otherwise excellent game.