Poor performance on an awesome machine

[Neuroboy23]

I have what I think is a great machine:

- Intel Core 2 Extreme QX6700 (2.66 GHz quad-core)
- 2 GB RAM
- 2x500GB HDD in RAID 0 configuration
- nVidia GTX 275

If I boot my machine and run Amnesia, I can turn every setting in the game to high and it runs flawlessly with a high FPS. However, if I quit the game and restart it, the performance with the exact same settings becomes pretty bad. This also happens when I transition between levels in the game, so I can't even get good performance out of a single session of the game. This is highly frustrating and, I think, points out a problem with the graphics card or driver more than the game. It's as if some leak is occurring when the graphics engine shuts down and whatever is flaky doesn't reset until I reboot my machine.

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PS: I am running Windows 7 64-bit.