Chaos Cloth takes 3-5min 'Evaluating nodes...' [Screenshot]

Hi;
This is my first time working with Chaos Cloth and I’m working on importing garments designed in Clo3D and Marvelous Designer. When I change anything the BP, UE jumps into ‘Evaluating nodes’ for 3-5min every time, even when animation is paused. From YT videos I’ve watched this does not appear to be the norm. What could be causing this?