zbrush to daz3d lagging

every time i bring cloths to the daz3d from the zbrush, it's start lagging and make the daz too slow. so i used desimation master and reduse the size to 20k (i redused total points from 2 million to 396,777) and still lagging. can you tell me what i can do to avoid this ?
Comments
That is still quite a lot of geometry. Is this just a static prop or are you rigging it?
It's a top, bottom, belt, and shoe. how much should i reduce ?