Recently I got more and more lag while playing FH2. Basically lagspikes that seem to come and go in waves, Usually you'd expect lagspikes to appear when you enter a new area and new shit is loaded, but in my case even if I lay still facing a wall, the framerate drops regularly every 20 secs only to go up again after about 8 seconds. Between the spikes the game runs smooth. It is not server lag. I also had this in other games (L4D2 for example).
I have a 1.9Ghz Dual Core processor, 3 gigs of RAM, Vista 32-bit and a ATI Mobility Radeon HD 2400.
Turning down the graphics seems to do nothing. I have enough space on C:. Ran a Virus check and found nothing.
Any ideas?