Well you obviously can’t have everything, however I did not yet notice the mentioned behaviour (perhaps it depends on the skin width param). Newton for example is quite accurate as far as simulations go, however with 30 stacked cubes you will probably be looking at a slideshow. When creating a scientific simulation for example you might consider a physics library on accuracy over speed, however I don’t think that many gamers will be as fussy, as long as everything blows up to hell.