Once you have all that in place, it takes from four hours to half a day to rig. I don't have to worry so much. With any explosion or mechanical effect there's a chance of something you didn't check going wrong. It's like they put an eraser on the pencil. Morris and Flame I do think digital effects have been pushed past the point where they work well.
Fire is a fractal event and fractal graphics are a fairly processor-heavy operation.
Even a small fire, like a match, is probably 600 fractal images deep. It's very difficult to make and there is probably not enough processor time in the world to get it down at this point. I understand this may change. When I took Fortran programming in about 1965, we had an IBM machine with a 100-cycle processor speed. It covered the whole floor of the engineering building at the University of Colorado and it had 4K of memory, about as much as my little pocket cell phone.