I have a scene in which I added some smoke to enhance an object's movement. As the scene is set in the clouds I have a lot of volume shaders, which I have had no problem rendering. After adding the smoke I noticed render times go from around 30 seconds per frame to about 50 minutes, and has made the rendered viewport shading unusable. I don't have any problem when not using the density attribute of the smoke simulation (obviously it won't work without it and will just render the domain).
Is this just a limitation with Blender or my hardware? Is there a way to speed up the render? I would rather a faster render time with less photo realistic results if possible.
I am using Blender 2.77a and am rendering with a GTX590 (have tried with CPU rendering and see similar increases in render times).