Lets compare Beta v 1.03.15527 to v15866

[Sven]

Thanks to Ataros, I set the effects detail to low, which gets rid of explosions and other effects, and therefore gets rid of the lock-ups.

I ran the Black Death track and I have an Average FPS now of 34

Of course this isn't a 'fair' comparison, because I dumbed down the graphics settings. I think I would've gained 2 fps in comparison with the old beta patch if the effects could remain on High.