Definitely realistic, I'm baking a video that demonstrates it pretty well. No billboarding, it feels and looks like flying through mist, which is what they are, no?

SweetFX is actually working nicely...

Just be careful when navigating the menus since they lag ALOT if you have SweetFX enabled.

Other than that, no issues for me. I am using the same SweetFX settings for my FS X.

I still have the same lagging....any help to avoid this? I love the sweetfx effect really but with p3d it is become risky :/