I have an array in a subpatch, when I applied graph-on-parent property to the subpatch (to view the array which holds sound so could be fairly large) Pd didn't like that. With dsp off it worked fine but when I turn dsp on Pd becames unusably slow to react (sliders, etc.). I was able to solve the problem by removing the graph-on-parent option. So it seems there is something in the interaction of graph-on-parent and the sound engine. this is on a planetCCRMA system: FC17 PD0.42-5extended Anyone else encounter such a problem? Any solution (beside moving things outside subpatches)? Thanks Oded