Also, because of the way the clothes are built out of panels (one for each piece of cloth) the dynamic clothes tend to use a lot of maps. I have noticed the two most recent items seem to be rather more efficient - or at least, they have fewer installers. As far as I know each optimisation thread loads only one texture, which it then converts into a tdl file and stores in the temp folder - so don't empty that after loading your files - but DS will run multiple copies of tdlmake at once on a multi-core system, so if each was processing a large file you could run out of memory.