Game performance heavily dependent on weather

[HolyPastrami]

So, while my PC isnt quite the newest, and cant really play the game on any high setting (AMD Sapphire 260), even on fast, the performance varies heavily, depending on the games weather. At good weather, i can easily get 30+ FPS, but on bad weather it can go as low as 10, specifically, it seems to be related to foam. Im not sure how the foam is rendered, but i do know that volumetric effects, like the clouds in War Thunder, can be really taxing for my performance. I can easily play War Thunder on Movie settings at 60 fps, but the framerate tanks by 20-30 if i enable the volumetric clouds there. Is it possible, perhaps, that the foam is calculated volumetrically? Or is it just particle effects?

[Ink]

Performance is not on the priority list right now. Full final optimization will be done after campaign is delivered, but thank you for the report!