They all come from the same channel (there's three types of rides, I believe). CPU is not the problem, but the memory - my poor 1 GB is not quite enough for anything else but DFH2 (takes 850 MB by itself) and a multitude of small plugins. Can't use any other programs, or there'll be nothing but hideous artifacts, screeches and other matrix-esque (unwanted) effects on the sound.
Don't confuse DFH 2 with DFH and DFH Superior, as I think the latter have customizable channel samples (which drums where), but I don't think DFH 2 has anything like that. At least I haven't been able to find any such options, and I've gone through the entire UI.