In my opinion the bevel defeats the purpose of using few sprites to make a bigger cloud. If you could have 5 sprites, some filling and debris, you could make a decent looking explosion.
Yeah, but for that example I wasn't really going for speed, I was looking for a nice effect, I think it moves more realistically with more particles. In a game, I agree, for a steady framerate less is the way to go. I used the bevel to make the smoke look 3D and one cloud, I think it works well, but wouldn't be the best way to go for practical use in a game.
Hmm, that explosion idea is interesting, I did something very similar in MMF2, using a few fiery explosion particles and a couple of large smoke clouds which grow and fade, works well but the particles have to be animated for the best effect.
My system doesn't like the motion blur.
The framerate mode needs changing to Unlimited if you wanna turn the motion blur off, otherwise it doesn't work, I overlooked that bit, sorry.