I regularly receive pdf drawings of machinery in vector format to create 3D models from. These machines are very large and the line count very high. MOI performance slows considerably when working with these files. I thought hiding the style/type (curve)/object that these lines belong to would restore performance but it doesn't seem to have any appreciable effect. Is this to be expected? If so is it possible to enable this functionality so that hiding objects removes them from the memory set or something - perhaps a frozen state or something? Thanks.