You are correct. You can let the object spin faster, but because an animation is build up out of frames it looks like it's spinning slowly or backwards. It's a bit like the wheels of a car: When a car starts driving you see the wheels turn, but as the car goes faster the weels seem to slow down again and even rotate backwards eventually and if the rotation speed keeps increasing they can seem to slow down again and go forward and then slow down again etc. When you use a higher frame-rate you can give more detail to your animation and you can rotate the object faster, because there are more frames to render the rotating object. But ofcoarse there's a limit to this because the human eye also has a refresh-rate. Animate the texture: You can animate the phase, noise etc. of the texture in the DTE to create the effect of 'morphing'dust-clouds. This works best with fuzzy or volume textures, wich are probably the textures you are using. rotate your model slightly to create the larger movements: I find it hard to explain this in english, ut I'll try: If you look at a real tornado it doesn't really seem to move really fast unless it's up close like in some scenes of the movie twister. You can create the effect of fast movement with the 'morphing' and blurred and maybe even rotating textures. The movement of the tornado over the terrain and the trunk(is this how you call it in english?) that could for instance bend, get wider or smaller are what I meant with the larger movements. They are less detailed and more subtle.

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