when running my game the performance starts out fine then it slowly gets worse and about 10 minutes later the performance have dropped quite notably (goes from about 512 fps to about 400 and gameplay is alot slower).
i have tried to figure out what is causing it but havent managed to.
i would like to hear if anyone have had a similar experience or maybe have an idea what might cause this performance drop over time.
it happens even if im just standing still and doing nothing at all.