Found this on Facebook…
Clouds Mission for you to try. Single Player - Free Flight -LOTS OF CLOUDS
Cliffs of Dover does create some spectacular environments, but often players don’t know how to implement them. So, here are two missions that show mass cloud formations in Cliffs of Dover. One is a frame-rate killer…the other was worked on by TF member Bolox and works with cloud layers to give beautiful results while maintaining a playable frame-rate. So attached are the two mission with instructions on how to use them.
PLEASE READ THE INSTRUCTIONS!!!
Single Player - Single aircraft free-flight Missions.
I was going to share a screenshot but I figured I’d let you have a play yourselves.
Missions are by Bolox and the one entitled frame-rate killer is exactly that. You have been warned!!!
I look forward to seeing some results in this thread 
Cheers, MP
BTW, if you enable your frame-rate counter it would be interesting to hear what results you are getting?
ENJOY
Download here:
https://www.mediafire.com/?4g8ltr1gbdjm78w