It is a simple trick that will slash your render times when using density. Go to the rendering tab- Mapping curve for density and open it. Click on the first knot on the lower left, it will be set to 0/0. Change the horizontal value to 0.01 and voila…watch the render times plummet !
If you want to learn more check out my video tutorials.
Here is a free 45 min introduction to get you up to speed :
https://youtu.be/5P2fA5mUeu8
And here you can buy my full 17 hour training series :
http://store.payloadz.com/go?id=2605809
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Just a note. You have to be careful with this…if you cut out too much it can drastically effect simulations with high res and fine detail. Experiment on a still. I was pulling my hair out trying to get a look I was after and failing then I realised I overdid it with this trick. Great for explosions but for scenes such as wispy smoke you need to be careful
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