With the Draw as Bounding Box in 3D option libraries are made into linear frames and work in perspective faster.
Location of Draw as Bounding Box in 3D Feature
Select the object you want to show as a bounding in the 3D model and click on the Properties line from the pop-up menu by clicking the right mouse button.
Select the library object and click the right mouse button.
Click the properties line from the drop-down menu.
Check the draw as bounding box in 3D option.
Close the dialog by saying OK.
The library will only be displayed as a contour in the 3D model.
With draw as bounding box in 3D unchecked
With draw as bounding box in 3D checked