Massive FPS Drop on High Spec Rig ?

[mZLY]

Hi guys,

I purchased Amnesia recently, installed and loaded it up to find I was getting 15-20 FPS. I put it down to poor optimisation as it's an indie game and just continued playing. I got bored quite quickly due to the dire performance and closed the game.

This evening I thought I'd give the game another chance and loaded it up to find I was getting a steady 60 FPS this time. Success! The game looks great and I'm enjoying playing now...

Continued playing for 2 or 3 minutes until I picked up a note, the character read it and when the game resumed I had 15 FPS again. What's up with that?!

It isn't an overheat issue, my temps are fine and there was no gradual slowdown, it was literally a solid 60 FPS 1 minute, 15 the next. Drivers are up to date and my system isn't struggling with the game in the slightest. Anyone got any ideas?? :S

System specs...
i7 870 @ 3.6Ghz
8Gb RAM
Gigabyte HD 6970 2Gb (overclocked slightly)

Playing on max settings, 1080p but really shouldn't be having problems. I play everything on max settings, 1080p.