Quote - You're not new to this, so I'm assuming you've already unticked Luke's hair (which for some reason ticks itself) as a collision object, as well as head and hands and feet. And you've checked to make sure no part of the cloth intersects with the target figure (even 'round the back). The other thing I tend to do is load textures - especially hi-res ones - after the sim to conserve on RAM.

I did indeed check the collision items.  I do not, however, concern myself especially with the clothing item intersecting with the figure.  Doesn't seem to be a problem for me these days.  But thanks for the suggestions