i'm interested about it too.
i've start something with maya's fluid but not in houdini's one.
the major problem is the variation of the sym. create the base of the mushroom and make it grow up is hard
nuclear blast have a very special flow
hi i have the same problems on my Macbook pro
i have houdini 10.0.249.3 and it's impossible to simulate something less than an hour !
i have houdini 9 before and there is no problem with it.
please help us