Its amazing how some people can judge whats wrong and whats not when they have no clue on computers.
I have a Sony Vaio VPCF13S1E. CPU i7 Q740, 6GB RAM, NVIDIA GeForce GT 425M, and Windows 7 64bit Home. Not gaming pc but nevertheless...
I have a huge problem with FPS spikes. I installed the game on a fresh windows installation with all the updates downloaded, latest drivers etc ( <--- referring to the uber computer guys again...) and it was impossible even to move my char in game. So i installed this DirectX 9 fix and things got better. All in all I tried every single fix out there and nothing + game booster. It didnt matter if i had high settings or super low with 1280x720 resolution. The FPS spikes where reaching 1 fps!
After the 1.5 update the very low settings gave me 60 fps on 1680x1050 while before i was around 30. The big difference is that now I can play the game because the FPS spikes drop to 15-20 frames per second.
So now I wonder if people with SLI and gaming pcs that I saw on forums complaining, get lag spikes from 110 to 30 fps because they have cpu issues or old installation. Why dont you go take a walk in the park and leave the forums free?