If you have the Use lightweight assemblies option selected in the File import and export options, external components will be loaded as lightweight components. Only the component's graphic information is loaded.
A lightweight assembly component uses less memory than an object that is fully loaded. You can quickly view the component with the Orient tools. When you are ready to work with it in DesignSpark Mechanical, you can load the geometry information.
See also Displaying lightweight components and Internal and external components.
To load a lightweight component
Right-click the component in the Structure tree and select Load Component from the context menu.
The component and all its subcomponents' geometry information is fully loaded. You can modify the components with any DesignSpark Mechanical tool.
To make an external component lightweight
Right-click the component in the Structure tree and select Make Lightweight from the context menu.
The component becomes lightweight and uses less memory. You cannot make an internal component lightweight.