Instead putting the collider tags on the trusses , put them on more simple dummy boxes that are not visible . This will help speed up your simulation . Also if you don ' t need those things to animate you can do that separately for each step and then bake the stuff in parts let simulations run for each part and then remove the cloth tag when it ' s in the right position . Also I ' m not sure how you handle the cloth , but I would make sure to fix some points first and then use the cloth dresser function . That should work much better than just letting the simulation run via animation . But it ' s probably tricky to do that with cloth , not sure it ' s the right approach . But I probably would try it too first and then settle with some simple objects and displacement textures .